| 单词 | isotope |
| 例句 | This method is based on the slow decay of radioactive carbon 14, a very minor component of carbon, the ubiquitous building block of life, into the nonradioactive isotope nitrogen 14. Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z Sure enough, conflict between them broke open at the end of January, when Lawrence appeared in Chicago with a proposal to centralize all the plutonium and isotope work, including the atomic pile, at Berkeley. Big Science 2015-07-07T00:00:00Z It was based on the realization that all living things have within them an isotope of carbon called carbon-14, which begins to decay at a measurable rate the instant they die. A Short History of Nearly Everything 2003-05-06T00:00:00Z The only reason I noticed him at all was because he asked for help on the isotopes and half-lives unit. The Sun Is Also a Star 2016-11-01T00:00:00Z The most abundant isotope, U-238, was harder to nudge toward fission than to move a recalcitrant donkey, and it responded only to fast, or highly energetic, neutrons. Big Science 2015-07-07T00:00:00Z What they discovered were new examples of nuclear isomerism, in which isotopes of identical mass numbers and changes show dramatically different radioactive characteristics. Big Science 2015-07-07T00:00:00Z The chemical is also a radioactive isotope, which means it can be visualized using a PET scan. A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age 2014-09-23T00:00:00Z Outsiders might disdain the lab’s focus on radioisotope hunting, but filling in the roster of isotopes throughout the periodic table was important work. Big Science 2015-07-07T00:00:00Z The material they had isolated would be the most important biological isotope of all, and the key to a wide range of research requiring precise biological tracing and dating. Big Science 2015-07-07T00:00:00Z Compton’s report of the Schenectady meeting to Bush asserted firmly the practicality of building a “fission bomb of superlatively destructive power” and of separating isotopes on an industrial scale for no more than $100 million. Big Science 2015-07-07T00:00:00Z But he found the process “distinctly unpleasant”— especially following a prolonged and ultimately fruitless wrangle with the patent office a few years later over his methods for producing radioactive isotopes. Big Science 2015-07-07T00:00:00Z In 2001 researchers at the California Institute of Technology analyzed helium isotopes from sediments left from the later KT impact and concluded that it affected Earth’s climate for about ten thousand years. A Short History of Nearly Everything 2003-05-06T00:00:00Z The sample weighed about a thousandth of a grain of sand, but it was thirty-four times more concentrated with the fissionable isotope than was natural uranium. Big Science 2015-07-07T00:00:00Z Fortunately, cyclotrons were still all the rage, especially among biomedical foundations anxious to keep the supply of medical isotopes flowing. Big Science 2015-07-07T00:00:00Z The discovery of a fissile isotope that could be separated from its parent by chemical means might quell the skepticism still bogging down the uranium program. Big Science 2015-07-07T00:00:00Z The longer an isotope’s half-life, the more muted its radioactivity, and, therefore, the more difficult it was to detect. Big Science 2015-07-07T00:00:00Z Teller believed a promising option to fuel a Super bomb would be to use tritium, a superheavy isotope of hydrogen. Big Science 2015-07-07T00:00:00Z John was surprised at the meager demand in Berkeley for the isotopes being discovered and manufactured by the cyclotron with the efficiency of an assembly line. Big Science 2015-07-07T00:00:00Z But a long-lived fissionable isotope, especially one that could be chemically separated from its uranium grandparent, might be especially suitable for a bomb. Big Science 2015-07-07T00:00:00Z The explanation, Bohr recognized, lay in the prevalence of distinct uranium isotopes. Big Science 2015-07-07T00:00:00Z The burden fell most heavily on Martin Kamen and others tasked with isotope production. Big Science 2015-07-07T00:00:00Z Yet Ernest considered the willing distribution of isotopes to all applicants to be a crucial component of the lab’s development. Big Science 2015-07-07T00:00:00Z Add a neutron or two and you get an isotope. A Short History of Nearly Everything 2003-05-06T00:00:00Z By January 20, 1942, Seaborg was confident enough to write McMillan with assurance that the bombardments had produced an unknown isotope of element 94. Big Science 2015-07-07T00:00:00Z His discovery was a triumph of scientific deduction, for the neutron, which gives deuterium its additional weight, was not discovered until many months after he identified the isotope itself. Big Science 2015-07-07T00:00:00Z Wealthy research foundations were especially interested in isotopes for medical research and cancer treatment. Big Science 2015-07-07T00:00:00Z With his customary bravado, he reported that the first calutron in the big magnet would start separating uranium isotopes within three weeks. Big Science 2015-07-07T00:00:00Z As cyclotrons around the world contributed to the list of known isotopes, rumors and expectations began to surface that the accelerator’s inventor might be in line for the Nobel Prize. Big Science 2015-07-07T00:00:00Z The new isotope’s potency and the efficiency of the cyclotron in producing it surprised even experts accustomed to Lawrence’s guileless optimism. Big Science 2015-07-07T00:00:00Z He felt some empathy with Lawrence over what he called the “gold rush of isotopes,” because he recognized the importance of public relations and “missionary work” for the lab. Big Science 2015-07-07T00:00:00Z The equation involved a certain amount of fanciful math, but there was no disputing that the cyclotron was beginning to pay its way as a producer of radioactive isotopes on an industrial scale. Big Science 2015-07-07T00:00:00Z Lawrence donated the unfinished 184-inch to the bomb effort by converting it to a mass spectrograph for the separation of uranium isotopes. Big Science 2015-07-07T00:00:00Z Lawrence’s brusque four-paragraph letter reported deuteron-induced radioactivity in fourteen light elements and speculated brashly that “in these nuclear reactions new radioactive isotopes of many of the elements might be formed.” Big Science 2015-07-07T00:00:00Z When they ceased the bombardments, however, the emissions continued in the same pattern as one would expect from a naturally occurring radioactive isotope. Big Science 2015-07-07T00:00:00Z Since isotopes are chemically identical, a nonchemical means had to be found to accomplish this. Big Science 2015-07-07T00:00:00Z Even Harold Urey, who was a member of the Briggs committee, had no luck obtaining access to other scientists’ work to help him develop an isotope separation process for uranium. Big Science 2015-07-07T00:00:00Z One day he told Seaborg triumphantly that he had found an alpha emitter and had already ruled out that it could be an isotope of element 91, 92, or 93. Big Science 2015-07-07T00:00:00Z In contrast, for any of the physicist’s elementary particles and isotopes and of the chemist’s molecules, all individuals of the entity are identical to each other. Guns, Germs, and Steel: The Fates of Human Societies 1997-03-01T00:00:00Z All four elements had stable isotopes, however, which Urey was assiduously producing in his own lab for a wide range of studies. Big Science 2015-07-07T00:00:00Z Harold Urey, a Berkeley chemistry PhD working at Columbia, had set out to identify a heavy isotope of hydrogen that had been postulated by Raymond Birge, among others. Big Science 2015-07-07T00:00:00Z Lawrence granted him priority access to both the thirty-seven-inch and sixty-inch cyclotrons for a “systematic and energetic campaign” to find long-lived radioactive isotopes of carbon, nitrogen, or oxygen, with carbon-14 the main quarry. Big Science 2015-07-07T00:00:00Z Instead, he probed the explosive characteristics of U-235 and soon realized that a bomb could be made from roughly a pound of the separated isotope. Big Science 2015-07-07T00:00:00Z Kamen soon was drafted by the physicist Jackson Laslett to help with the chemical separation of sodium isotopes, and the chemist Glenn Seaborg was absorbed into a team working with uranium. Big Science 2015-07-07T00:00:00Z All we need do is procure a sample of, say, Phobos or a comet and examine its magnesium isotopes. Cosmos 1980-01-01T00:00:00Z In a different corner of the Galaxy, a different sequence of events should have occurred and a different ratio of magnesium isotopes should prevail. Cosmos 1980-01-01T00:00:00Z He had moved to Berkeley in the 1940s, briefly joining scientists to separate and purify isotopes for the Manhattan Project. The Gene 2016-06-02T00:00:00Z This was an extraordinary range of experimentation unmatched by its rivals: in 1939 Birge calculated that the Rad Lab had discovered more than half of all isotopes identified by cyclotrons worldwide. Big Science 2015-07-07T00:00:00Z More isotopes were being shipped by the Rad Lab across the country, to Chicago, Boston, and New York, than across campus. Big Science 2015-07-07T00:00:00Z But theirs was not a natural isotope, it was an unstable isotope of phosphorus created in their laboratory. Big Science 2015-07-07T00:00:00Z Our new method goes even further, by measuring isotopes in a particular carbon atom on each amino acid. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z The cosmic origin theory is based on their carbon isotopes and high hydrogen content. Out of this world: 555.55-carat black diamond lands in Dubai 2022-01-17T05:00:00Z More recently, scientists have been able to measure isotopes in each of the 20 individual amino acids that make up proteins. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z We then sent these carbon atoms — from a very metabolically active part of the amino acid called the carboxyl group — through a machine called a mass spectrometer to read their isotope fingerprints. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z In “The Red-Haired Boy and the Pug-Nosed Girl!” a childhood misunderstanding divides soul mates for decades, until they find each other working at the same research foundation — “working on radioactive isotopes,” no less. In These Elegant Comics, Love and Darkness Collide 2020-02-14T05:00:00Z For example, the most common kind of carbon is carbon-12, but there is also an isotope called carbon-13 that is a little heavier. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z Our new technique looks at isotopes inside amino acids to see how metabolism is working. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z To university administrators he promised prestige, to biologists medical isotopes, to industrialists new materials and energy sources, to philanthropists glory. ‘Big Science,’ by Michael Hiltzik 2015-07-13T04:00:00Z The isotopes in her tooth enamel reveal that she was actually born in Rome, and the jet beads, rich damask and gold thread of her shroud suggest she was an aristocrat. The other London underground: See the ancient city that lies beneath the modern metropolis 2016-06-09T04:00:00Z A stalagmite found just above the remains has been dated as 600,000 years old, using natural uranium isotopes, and Sima scientists argue that the fossils must be older. Scientists are accused of distorting theory of human evolution by misdating bones 2012-06-09T23:07:18Z Still, in the end, they bring a Dollar General distribution center to town and convince a manufacturer of medical isotopes to locate its headquarters in Janesville. “Janesville” and the Dangers of American Optimism 2017-05-19T04:00:00Z In addition to physical resemblances and Mr. Ngoc’s statements, Mr. Faunce has a dentist remove one of his molars for an isotope test that, according to the film, reveals he was born in America. U.S. Says Man in the Film ‘Unclaimed’ Is Not an Ex-P.O.W. 2013-05-03T22:50:57Z By analyzing oxygen and strontium isotope data, they were able to draw conclusions about his geographical locations and his diet. The Richard III Diet: Wild Birds, Frequent Feasts and Plenty of Wine 2014-08-18T04:00:00Z They imagined that after hitting the young Matt Murdock, the container filled with the isotope ricocheted into the path of a bystander carrying a fishbowl filled with four baby turtles – his pets. It's all connected! Pixar and the history of surprising film and TV shared universes 2017-01-19T05:00:00Z We can measure the ratio of heavy to light isotopes in biological molecules such as proteins to learn about the organism that produced them. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z When they compared the isotopes of lead in the blood to those from other possible contaminants, the isotopes most closely matched that of turmeric. The vice of spice: confronting lead-tainted turmeric 2023-08-02T04:00:00Z Unlike other atomic isotopes, this one — developed by a neighborhood nuclear physicist — absorbs energy, doubling in size every 12 hours. Alchemy Amok in ‘Gold’ and Its Offspring, ‘The Magnetic Monster’ 2016-07-01T04:00:00Z By peering deep into the isotopes of amino acids, we will be able to understand eukaryote metabolism like never before, in animals, plants and fungi. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z Canada is like an isotope of the United States: just enough dissimilarities, in unpredictable places, that you feel you can’t really take anything for granted. In Saint John in Canada, Exploring the Legacy of the Loyalists 2016-10-27T04:00:00Z Scientists used a precise dating system based on the radioactive decay of uranium isotopes into thorium to assess the age of the paintings. Primitive art: Neanderthals were Europe's first painters 2018-02-22T05:00:00Z Traditionally, scientists would analyze the overall isotope ratio of the entire protein. Ever wonder how your body turns food into fuel? We tracked atoms to find out 2023-09-05T04:00:00Z Litvinenko, who had been granted British citizenship and become a vocal critic of the Kremlin, died after someone slipped polonium-210, a rare radioactive isotope, into his cup of tea at a London hotel. Between Seth MacFarlane and the Onion, Oscars night was a festival of misogyny 2013-02-26T15:30:58Z Nine pounds of a cesium isotope known as “fear powder” have gone missing. Review: In ‘Mile 22,’ Mark Wahlberg, Patriotism and Paranoia 2018-08-16T04:00:00Z Scientists used a precise dating system based on the radioactive decay of uranium isotopes into thorium to assess the age of the paintings. Primitive art: Neanderthals were Europe's first painters 2018-02-22T05:00:00Z The researchers compared the oxygen-stable isotope records preserved in glacial ice at these different elevations on the mountain. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z "Going into the project, there were no published nitrogen isotope data from fossilized plant foliage," Kipp said. Plants that survived dinosaur extinction pulled nitrogen from air 2023-11-16T05:00:00Z Konecky and the project team knew, however, that water isotopes record climate signals in specific ways in different natural archives. Study links changes in global water cycle to higher temperatures 2023-11-02T04:00:00Z Since AMS facilities around the globe are designed differently, the various facilities can complement each other in the search for rare isotopes from supernova explosions. Exploding stars 2023-11-02T04:00:00Z Some researchers extracted cores of sediment from lakes in the region, analyzing oxygen isotopes and pollen grains that traced how temperatures and vegetation had changed over the past 46,000 years. In Peru, a 20-year study charted Amazon forests—and revealed how warming has changed them 2023-11-02T04:00:00Z Scientists who study ice cores use isotopes as a proxy for temperature change over time, but in tropical regions interpreting the isotope records can be a more complex process. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z "If our model is correct, the blobs should have isotopes - trace elements - that are similar to the lunar mantle rocks, which can be tested in future lunar missions," Yuan said. Relics of huge primordial collision reside in Earth's deep interior 2023-11-01T04:00:00Z "We decided to start with water isotope records because they reflect holistic signals and because they're recorded in all kinds of different natural archives," Konecky said. Study links changes in global water cycle to higher temperatures 2023-11-02T04:00:00Z Wallner is particularly interested in the radioactive iron isotope with the atomic mass of 60. Exploding stars 2023-11-02T04:00:00Z One limitation is that JT-60SA will only use hydrogen and its isotope deuterium in its experiments, not tritium—a third form of hydrogen that is expensive, scarce, and radioactive. First plasma fired up at world’s largest fusion reactor 2023-10-31T04:00:00Z Their findings showed that the isotope records share a statistically significant relationship with sea surface temperatures in the Pacific and with rainfall over tropical South America. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z One of the study's collaborators, anthropologist Nathaniel Dominy from Dartmouth College in the United States, had already used stable isotopes to identify the respective geographic locations of mummified baboons. Origin of ancient mummified baboons found in Egypt 2023-10-24T04:00:00Z They also found that the ratio isotopes for a different noble gas, neon, matches the conditions believed to have existed on Earth when the planet was formed millions of years ago. Like a saggy balloon, Earth's core is leaking helium, a new analysis finds 2023-10-24T04:00:00Z About half of these isotopes, called iron-60 for short, have turned into a stable nickel isotope after 2.6 million years. Exploding stars 2023-11-02T04:00:00Z Today, advances in archaeological analysis make it possible to pinpoint all sorts of information about individuals—from their favorite foods to the type of climate they inhabited—by examining the isotopes of a specimen. How scientists bring ancient faces back to life 2023-10-23T04:00:00Z The oxygen-stable isotopes from the summit were also found to be more sensitive to large-scale changes in tropical Pacific sea surface temperature than the ones found at the lower levels of the mountain. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z They also capture uranium isotopes from the environment as they form, which serve as a timer that starts from the moment the zircons crystallize. The moon is even older than we thought 2023-10-23T04:00:00Z These isotope ratios helped the scientists deduce that the helium did not come from Earth's mantle, but must have originated from the core. Like a saggy balloon, Earth's core is leaking helium, a new analysis finds 2023-10-24T04:00:00Z The same applies to the plutonium isotope with the atomic mass of 244. Exploding stars 2023-11-02T04:00:00Z For example, as trees and mutualistic fungi work together, a larger proportion of heavy nitrogen isotopes are left in the fungi, as heavy isotopes are more difficult to move. Fungal evolution discovered: Mycena can now invade living hosts 2023-10-23T04:00:00Z This is significant because it suggests that depending on the elevation, past climate histories recorded by the oxygen-stable isotopes may reveal different mechanisms or stories about the region. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z Uranium isotopes decay into lead at predictable rates. The moon is even older than we thought 2023-10-23T04:00:00Z So, the fuel needs a larger percentage of this isotope, entailing higher uranium-235 enrichment than the 4 percent enriched LEU typically used in nuclear power plants. U.S. Plan to Put Weapons-Grade Uranium in a Civilian Reactor Is Dangerous and Unnecessary 2023-10-20T04:00:00Z After a period of 80 million years, about half of the plutonium-244 isotope has turned into other elements. Exploding stars 2023-11-02T04:00:00Z According to Drake, the carbon isotope analysis also shows that most of the carbon comes from the forest vegetation, not the peat. Researchers study one of the world's darkest rivers 2023-10-18T04:00:00Z Overall, their results suggest that the influence of tropical Pacific climate on the summit isotope records is increasing, likely due to the rapid rates of climate change observed in recent decades. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z Tallying the lead isotopes resulted in an age of 4.46 billion years, the oldest age for the lunar crust’s formation yet. The moon is even older than we thought 2023-10-23T04:00:00Z Because it decays at a known steady rate, this isotope is used to date organic materials. Traces of Oldest and Largest Solar Storm Found in Buried French Forest 2023-10-19T04:00:00Z But how do these isotopes get to Earth in the first place? Exploding stars 2023-11-02T04:00:00Z Before being released, the water is filtered to remove isotopes, leaving only tritium, a radioactive isotope of hydrogen that is hard to separate, plant operator Tepco says. Scientists test Fukushima fish after nuclear plant water release 2023-10-19T04:00:00Z "And if there's less precipitation, the isotopes are going to fractionate differently than normal," he said. Ice cores from Earth's highest tropical peak provide insight into climate variability 2023-11-15T05:00:00Z Smit conducted the isotope analyses of sulphide inclusions at Carnegie Institution for Science. Ancient diamonds shine light on the evolution of Earth 2023-10-18T04:00:00Z "When we measure the amount of heavy and light isotopes of hydrogen in the waxes, it reveals different physical processes like increased rainfall, or how far the water vapor travels," says Rubbelke. Paleoclimatologists use ancient sediment to explore future climate in Africa 2023-10-10T04:00:00Z So do the plutonium-244 isotopes, which were possibly created in other events and swept up by the supernova's expanding envelope. Exploding stars 2023-11-02T04:00:00Z The use of radium isotopes allowed the scientists to track how much nutrient is transported from the land and shelf sediments via invisible groundwater flows. Discovery of invisible nutrient discharge on Great Barrier Reef raises concerns 2023-10-09T04:00:00Z Radioactive isotopes of the salt ions calcium and sodium allowed the researchers to measure how much and how quickly the animals took up different ions. Consistent metabolism may prove costly for insects in saltier water 2023-10-06T04:00:00Z Smit is now based at the University of the Witwatersrand where she is part of a team developing a new isotope lab and methodologies so that diamond inclusion analyses can ultimately be conducted at Wits. Ancient diamonds shine light on the evolution of Earth 2023-10-18T04:00:00Z The technique is used to determine the age of organic material as old as roughly 60,000 years based on the decay of an isotope called carbon-14, a variant of the element carbon. New tests confirm antiquity of ancient human footprints in New Mexico 2023-10-05T04:00:00Z Fowler hopes studies of isotopes in the bones, which can serve as a geographic fingergprint, can show how those men and women moved during their lifetimes. Ancient marriage traditions—and politics—revealed in giant family trees built from DNA 2023-10-04T04:00:00Z Japan says the water is treated to remove most radioactive elements except tritium, a hydrogen isotope that must be diluted because it is difficult to filter. Tepco starts releasing second batch of treated radioactive water from Fukushima nuclear plant 2023-10-05T04:00:00Z Because of the distinct difference in the oxygen isotope composition between summer and winter precipitation, it is possible to estimate the relative contributions from each season. Scientists investigate Grand Canyon's ancient past to predict future climate impacts 2023-10-02T04:00:00Z And with the Office of Experimental Sciences measurements now concluded, the team is looking to apply the skills and methodologies they've acquired with fission neutron measurements to a series of other isotopes. Chi-Nu experiment ends with data to support nuclear security, energy reactors 2023-09-28T04:00:00Z After an organism dies, this isotope changes into other atoms over time, providing a metric for determining age. New tests confirm antiquity of ancient human footprints in New Mexico 2023-10-05T04:00:00Z In this study, the researchers combined NanoSIMS with stable isotope labeling, to visualize isotopic variations within tissues at high resolution, providing insights into the metabolic activity of individual cellular compartments and organelles. A deep look into the progression of Parkinson's Disease 2023-09-29T04:00:00Z Noah Planavsky, an isotope geochemist at Yale University’s Center for Natural Carbon Capture, says the practice would certainly reduce the CO2 in the air—but the overall situation is not that simple. Pipelines Touted as Carbon Capture Solution Spark Uncertainty and Opposition 2023-10-01T04:00:00Z Variation in uranium-234 isotope and changes in the growth thickness of stalagmite give indication of the change in the amount of precipitation. Scientists investigate Grand Canyon's ancient past to predict future climate impacts 2023-10-02T04:00:00Z When those neutrons hit the uranium-238 isotope, a fission event, or splitting of the uranium-238 nucleus, can occur and is recorded. Chi-Nu experiment ends with data to support nuclear security, energy reactors 2023-09-28T04:00:00Z Luckily for dendrochronology, spikes in cosmic radiation generate spikes in atmospheric levels of carbon-14, the isotope whose slow decay is the clock that anchors radiocarbon dating. New earthquake study: 'The big one,' but make it double? 2023-09-27T04:00:00Z Data from strontium isotopes indicate that this interpersonal violence occurred between local groups, not between local and foreign populations. New study reveals a long history of violence in ancient hunter-gatherer societies 2023-09-21T04:00:00Z By finding the “nuclear forensic fingerprint” of different isotopes of cesium, some of which are radioactive, Steinhauser’s team ruled out Chernobyl as the source of contamination. ‘Nature does not forget’: These 4 animals are radioactive 2023-09-21T04:00:00Z The new laser melting sampler overcomes both these problems; it has high depth-precision and does not destroy the critical oxygen and hydrogen isotopes found in water, which are needed to infer past temperature. Laser-based ice-core sampling for studying climate change 2023-09-19T04:00:00Z Researchers continue sketching out the full picture of actinide isotopes. Chi-Nu experiment ends with data to support nuclear security, energy reactors 2023-09-28T04:00:00Z Study co-author Geoff Duller, an earth scientist at Aberystwyth University in Wales, says the team tried to date the logs using radioactive carbon isotopes, which can show when trees were felled. Earliest Evidence of Wooden Construction Uncovered 2023-09-20T04:00:00Z The proportion of the radioactive carbon-14 isotope that is absorbed by living organisms into their tissue decays over time, which allows scientists to determine the approximate year of death of the specimen. A close encounter with the 'alien bodies' in Mexico 2023-09-16T04:00:00Z Marissa Moss: They discovered that if you use a different isotope of uranium, you needed much less of it. How Antisemitism and Professional Betrayal Marred Lise Meitner’s Scientific Legacy 2023-09-14T04:00:00Z The U.K. has always been a major player in research on fusion, which melds light atoms—usually hydrogen isotopes—to release abundant, carbon-free energy. U.K. participation in the world’s largest fusion experiment is in doubt 2023-09-07T04:00:00Z Additionally, the presence of isotopes on the rock indicates it was exposed to cosmic rays — high-energy particles from space. Mystery Rock Found In Sahara Desert Could Be World's First "Boomerang Meteorite" 2023-09-01T04:00:00Z But these logs contained only tiny levels of such isotopes, indicating they were more than 50,000 years old—the practical limit for the technique in this region. Earliest Evidence of Wooden Construction Uncovered 2023-09-20T04:00:00Z The level of isotopes suggests the stone had been drifting through space for at least 10,000 years before falling to Earth. Mystery Rock Found In The Sahara Desert Could Be The World's First "Boomerang Meteorite"" 2023-09-01T04:00:00Z By combining a powerful set of instruments with some experimental savvy, physicists have for the first time detected oxygen-28 — an isotope of oxygen that has 12 extra neutrons packed into its nucleus. Rare Superheavy Oxygen Isotope Is Detected at Last 2023-08-31T04:00:00Z The most promising approach involves using a huge doughnut-shaped magnetic cage called a tokamak to contain the isotopes while heating them to 100 million degrees Celsius so that they react. U.K. participation in the world’s largest fusion experiment is in doubt 2023-09-07T04:00:00Z Because tritium, a radioactive isotope of hydrogen, is difficult to separate from water, the Fukushima wastewater is diluted until tritium levels fall below regulatory limits. Japan PM tells fisheries minister to apologise for calling Fukushima wastewater 'contaminated' 2023-08-31T04:00:00Z Jacobsen found that the ratios of iron isotopes in the spherules largely matched those of the Sun—a mark against an interstellar origin. Did interstellar debris fall to the sea floor? Claim meets sea of doubt 2023-08-30T04:00:00Z By comparing the relative masses of these isotopes in their samples, Feng and colleagues could figure out where the cesium originated. Germany’s radioactive boars are a bristly reminder of nuclear fallout 2023-08-30T04:00:00Z Scientists have long predicted that this isotope is unusually stable. Rare Superheavy Oxygen Isotope Is Detected at Last 2023-08-31T04:00:00Z The water is being filtered to remove most radioactive elements then diluted to reduce levels of tritium, a radioactive isotope of hydrogen which is difficult to separate from water. Fukushima: No detectable radioactivity found in sea after water released, Japan says 2023-08-27T04:00:00Z The environment ministry's tests of samples taken from 11 points near the plant concluded concentrations of radioactive isotope tritium below the lower limit of detection - 7 to 8 becquerels of tritium per litre. Japan says seawater radioactivity below limits near Fukushima 2023-08-27T04:00:00Z The utility filters most radioactive elements out of the water, but it dilutes tritium, an isotope of hydrogen, which is difficult to separate from water. Japan says no radioactivity found in Fukushima fish -Kyodo 2023-08-26T04:00:00Z An MP said she would call for a debate regarding the use of "radioactive isotopes in chapatis" once fed to South Asian women to study iron absorption. Debate call on radioactive chapatis fed to Coventry women in 1960s 2023-08-25T04:00:00Z Key to the whole operation were the intense streams of radioactive isotopes produced by the Riken RI Beam Factory in Wako, Japan. Rare Superheavy Oxygen Isotope Is Detected at Last 2023-08-31T04:00:00Z So when you're splitting a uranium or plutonium atom, depending on how many protons and neutrons end up in each half, you get a totally different, often totally unusual isotope. Meet the Physicist who Spoke Out against the Bomb She Helped Create 2023-08-24T04:00:00Z Tepco has been filtering the contaminated water to remove isotopes, leaving only tritium, a radioactive isotope of hydrogen that is hard to separate. Explainer: How Japan will release treated water from the Fukushima nuclear plant 2023-08-24T04:00:00Z Al-Qattan was working on his PhD in Herbert’s Tampa marine science lab analyzing oxygen isotopes in mollusk shells when the flaperon’s discovery made news around the world. Barnacles could help solve the mystery of Malaysian Airlines Flight 370 2023-08-23T04:00:00Z To find the answer, the researchers turned to mass spectrometry, a technique that can measure the mass of atomic isotopes. Cells Discovered Making ‘Dark Oxygen’ Underground 2023-08-22T04:00:00Z The nucleus of this isotope has one more proton than does 28O but the same number of neutrons. Rare Superheavy Oxygen Isotope Is Detected at Last 2023-08-31T04:00:00Z But Conrad and his colleagues were stunned that they were able to detect such tiny amounts of uranium and could match the isotope signature to the site’s nuclear history. Turtle Shells Record Nuclear History 2023-08-22T04:00:00Z Japan says the water will be filtered to remove most radioactive elements except for tritium, an isotope of hydrogen that is difficult to separate from water. Japan to release Fukushima water into ocean starting Aug 24 2023-08-22T04:00:00Z It has been treated to remove most radioactive elements except for tritium, an isotope of hydrogen that must be diluted because it is difficult to filter. Japan fisheries leader voices concern on plan to release Fukushima water 2023-08-21T04:00:00Z The water has been treated to remove most radioactive elements except for tritium, a hydrogen isotope that must be diluted because it is difficult to filter. Japan PM to meet fishing industry leaders over Fukushima water 2023-08-21T04:00:00Z Because the stability of different isotopes is a relative measurement, it would be helpful to compare 28O with this heavier, yet-unseen, near neighbour. Rare Superheavy Oxygen Isotope Is Detected at Last 2023-08-31T04:00:00Z Japan said it will remove most radioactive elements from the water except for tritium, a hydrogen isotope that must be diluted because it is difficult to filter. Kishida to visit Fukushima nuclear plant on Sunday before water release decision 2023-08-19T04:00:00Z That includes different types of uranium as well as deuterium, a hydrogen isotope that, in large amounts, could be used in reactors to make tritium, a nuclear weapons component. US tightens export controls of nuclear power items to China 2023-08-18T04:00:00Z Japan says it will remove most radioactive elements from the water except for tritium, a hydrogen isotope that must be diluted because it is difficult to filter. Analysis: Fukushima water release poses early test for Japan-South Korea unity 2023-08-17T04:00:00Z After death, the carbon-14 slowly decays into other isotopes at a predictable rate, allowing scientists to estimate a sample’s age to within a few decades. Raging wildfires may have doomed California’s ancient megamammals, tar pit fossils reveal 2023-08-16T04:00:00Z Fire and Rescue New South Wales said "low level radioactive isotopes" had been found. Radioactive material found as Australian border force raid Sydney home 2023-08-17T04:00:00Z By detecting this isotope in the rocks of the Himalayas, they were able to determine the altitude and age that the mountain range once was. Scientists radically rethink how the Himalayas formed millions of years ago, adjusting their age 2023-08-13T04:00:00Z Some of these questions may now be answerable, thanks to gene and isotope analyses in combination with archaeological observations. In a Stone Age Community, Women Moved While Men Stayed with Family 2023-08-10T04:00:00Z Piani points out that roughly equal parts solar wind, comets, water bubbling up from the mantle and chondrites could be combined to match Earth's isotope balance. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z Canada’s plans to make nuclear power a central part of its decarbonization strategy are taking shape with major announcements around large nuclear builds, small modular reactors and medical isotopes. Universal Music earnings boosted by strong sales 2023-07-26T04:00:00Z Earlier, local broadcaster Channel 10 had reported mercury and a uranium isotope were discovered. Radioactive material found as Australian border force raid Sydney home 2023-08-17T04:00:00Z To determine the age of the mountain range, Chamberlain and his team used a technique called triple oxygen isotope analysis. Scientists radically rethink how the Himalayas formed millions of years ago, adjusting their age 2023-08-13T04:00:00Z They also assessed isotope levels and performed carbon dating to learn more about when and where individuals lived. In a Stone Age Community, Women Moved While Men Stayed with Family 2023-08-10T04:00:00Z Hydrogen exists on Earth in two stable “flavors,” called isotopes: regular hydrogen, which has a single proton for its nucleus, and deuterium, whose nucleus is made of one proton and one neutron. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z Canada’s plans to make nuclear power a central part of its decarbonization strategy are taking shape with major announcements around large nuclear builds, small modular reactors and medical isotopes. In challenge to Tesla, major automakers launch EV charging network 2023-07-26T04:00:00Z Canada’s plans to make nuclear power a central part of its decarbonization strategy are taking shape with major announcements around large nuclear builds, small modular reactors and medical isotopes. Visa discloses further demands from US Justice Dept. over antitrust probe 2023-07-26T04:00:00Z Various manipulations of an element, like boiling, crystalizing or evaporating, change which isotope floats to the top or sinks to the bottom of a substance. Scientists radically rethink how the Himalayas formed millions of years ago, adjusting their age 2023-08-13T04:00:00Z Paul Bierman's laboratory at the University of Vermont dated the sample's last time near the surface in a different way, using rare radioactive isotopes of aluminum and beryllium. When Greenland was green: Ancient soil from beneath a mile of ice offers warnings for the future 2023-07-23T04:00:00Z Tritium, a radioactive isotope of hydrogen, has not been detected in the river water itself, Xcel Energy said in a statement. Low levels of radioactive tritium may be near the Mississippi River after an energy company’s leak 2023-07-21T04:00:00Z The “smoking gun” for a dark star would be a particular hiccup in the electromagnetic spectrum where light is absorbed by a particular isotope of helium only in dark stars, not in galaxies. JWST Might Have Spotted the First Dark Matter Stars 2023-07-20T04:00:00Z The Japanese government says the water has been filtered to remove most radioactive elements except for tritium, an isotope of hydrogen that is difficult to separate from water. Japan calls on China to approach Fukushima water release in 'scientific manner' 2023-07-14T04:00:00Z The locations of heavier and lighter isotopes that were discovered in the Himalayas could therefore provide clues into how tall things were at various points in the mountain range's history. Scientists radically rethink how the Himalayas formed millions of years ago, adjusting their age 2023-08-13T04:00:00Z These isotopes form when cosmic rays, originating far from our solar system, slam into the rocks on Earth. When Greenland was green: Ancient soil from beneath a mile of ice offers warnings for the future 2023-07-23T04:00:00Z It will have tritium and carbon-14, radioactive isotopes of hydrogen and carbon respectively that cannot be easily removed from water. Facts are up against fear ahead of Fukushima water release 2023-07-13T04:00:00Z Since 2021, it has required certificates showing levels of radioactive isotopes in wild mushrooms, some fish species and edible wild plants, such as bamboo shoots, from Fukushima and nine other prefectures. EU removes post-Fukushima curbs on Japan food imports 2023-07-13T04:00:00Z Japan says the water has been filtered to remove most radioactive elements except for tritium, an isotope of hydrogen that is difficult to separate from water. Japan to prepare for August start of Fukushima water release -Nikkei 2023-07-04T04:00:00Z By detecting this isotope in the rocks of the Himalayas, they were able to determine the altitude and age that the mountain range once was. Scientists radically rethink how the Himalayas formed millions of years ago, adjusting their age 2023-08-13T04:00:00Z Each isotope has a different half-life, meaning it decays at a different rate when buried. When Greenland was green: Ancient soil from beneath a mile of ice offers warnings for the future 2023-07-23T04:00:00Z Most radioactive elements have been filtered from the water, except for tritium, an isotope of hydrogen that is difficult to separate from water. Fukushima nuclear disaster: UN watchdog approves plan for water release 2023-07-04T04:00:00Z Tepco has been filtering the contaminated water to remove isotopes, leaving only tritium, a radioactive isotope of hydrogen that is hard to separate from water. Explainer: How Japan plans to release Fukushima water into the ocean 2023-07-04T04:00:00Z The water has been filtered to remove most radioactive elements except for tritium, an isotope of hydrogen that is difficult to separate from water. Japan to get crucial U.N. verdict for Fukushima water release 2023-07-04T04:00:00Z The water to be released, which has been mainly used to cool damaged reactors, will have traces of tritium, an isotope that is hard to remove from water. Japan would welcome EU lifting restrictions on food 2023-06-30T04:00:00Z By measuring both isotopes in the same sample, glacial geologist Drew Christ was able to determine that melting ice had exposed the sediment at the land surface for less than 14,000 years. When Greenland was green: Ancient soil from beneath a mile of ice offers warnings for the future 2023-07-23T04:00:00Z Russia’s Federal Security Service, the FSB, said five people were arrested for trying to smuggle a kilogram of the radioactive isotope Cesium-137 out of the country under the direction of a Ukrainian citizen. Ukraine’s president tells other countries to act before Russia attacks nuclear plant 2023-06-23T04:00:00Z Startup Twelve, named for the most common isotope of carbon, aims to make carbon products typically derived from fossil fuels using only renewable energy, water and CO2 that’s in the air. Washington state wins e-fuel and hydrogen power pledges at Paris Air Show 2023-06-19T04:00:00Z The isotope U-235 is fissile, which means that it can be split in a reaction that releases a lot of energy. The US will send depleted uranium munitions to Ukraine — an expert explains their health effects 2023-06-17T04:00:00Z The water will have most of its radioactivity removed and be diluted to internationally approved levels but will still contain traces of tritium, an isotope that is difficult to separate from water. Exclusive: Palau seeks more U.S. patrols of its waters after Chinese incursions 2023-06-15T04:00:00Z By comparing the ratio of uranium isotopes in a sample, which decay at different rates, researchers can estimate how long a specimen has been buried. Ancient humans traveled half the world to Asia before main migration out of Africa 2023-06-13T04:00:00Z This is where hydrogen isotopes will be heated to 150 million degrees Celsius, theoretically fusing together to release 10 times more energy than they take in. Technology: Powering the Future of Energy 2023-06-11T04:00:00Z If scientists can contain the fuel for fusion—a plasma mixture of deuterium and tritium, two heavy isotopes of hydrogen—the energy released in the reaction can make it self-sustaining. What Is the Future of Fusion Energy? 2023-06-05T04:00:00Z All uranium is radioactive, and each isotope has its own unique half-life. The US will send depleted uranium munitions to Ukraine — an expert explains their health effects 2023-06-17T04:00:00Z The concentration of tritium in the groundwater has declined and there have been no recorded measurements of the isotope beyond the plant, officials said. Over half of the contaminated water leaked at nuclear plant recovered, Xcel says 2023-05-24T04:00:00Z Carbon-12, the most common isotope of carbon, contains six protons and six neutrons. Concepts of Biology 2013-04-25T00:00:00Z While many fusion companies are looking to tritium, a rare hydrogen isotope, to help fuel reactions, Helion plans to use Helium 3, a rare type of the gas used in quantum computing. Microsoft to buy power from nuclear fusion company Helion 2023-05-10T04:00:00Z The world has abundant deuterium: this isotope constitutes 0.016 percent of natural hydrogen, so the seas are literally awash in it. What Is the Future of Fusion Energy? 2023-06-05T04:00:00Z All isotopes of uranium decay over time, emitting both radiation and energetic particles and transforming into different chemical elements. The US will send depleted uranium munitions to Ukraine — an expert explains their health effects 2023-06-17T04:00:00Z More recent forensic investigations, using isotope analysis, have narrowed down her place of birth to either the Netherlands, Germany, Luxembourg or Belgium. Police search for the names of 22 women murdered 2023-05-10T04:00:00Z After returning to the lab, the researchers put the guano through a battery of tests to pinpoint telltale traces of chemical isotopes, metals, and environmental DNA. 2200-year-old pile of excrement provides window into condors’ past 2023-05-02T04:00:00Z Inside the capsule sits a frozen pellet of the hydrogen isotopes deuterium and tritium. This Pioneering Nuclear-Fusion Lab Is Gearing up to Break More Records 2023-04-28T04:00:00Z The salvos damaged a nuclear facility used for the production of medical isotopes, but experts found no radiation leaks. U.S. Wires Ukraine With Radiation Sensors to Detect Nuclear Blasts 2023-04-28T04:00:00Z In this process, they produce specific isotopes of other radioactive elements such as thorium, protactinium and radium. The US will send depleted uranium munitions to Ukraine — an expert explains their health effects 2023-06-17T04:00:00Z One way of achieving fusion is to heat hydrogen isotopes to hundreds of millions of degrees, until they become so energetic they break apart into a whirling state of matter called plasma. The Israeli plan to fit a fusion reactor into a container 2023-04-27T04:00:00Z Operators of fusion plants will need to handle small amounts of tritium—a short-lived radioactive isotope of hydrogen—and safely dispose of low-level waste consisting of reactor parts made radioactive by fusion reactions. News at a glance: A new malaria vaccine, a Parkinson’s test, and editors resign 2023-04-19T04:00:00Z The lasers trigger an implosion, creating extreme heat and pressure that drive the hydrogen isotopes to fuse into helium, releasing additional energy. This Pioneering Nuclear-Fusion Lab Is Gearing up to Break More Records 2023-04-28T04:00:00Z Its energy would drive the fusion of hydrogen isotopes in the weapon’s second stage, generating yet more neutrons that would split additional fission fuel. Trust but verify: Can the U.S. certify new nuclear weapons without detonating them? 2023-04-20T04:00:00Z The radioactive isotope forms continuously in the upper atmosphere as cosmic rays—high-energy particles from space—collide with gas molecules, spawning neutrons. Marking time: Cosmic ray storms can pin precise dates on history from ancient Egypt to the Vikings 2023-04-13T04:00:00Z Previous studies indicated the lead isotope signature in the Benin Bronzes was consistent across hundreds of works made from the 16th century onward, indicating a common source. News at a glance: Benin Bronze’s source, a supermassive black hole, and Aboriginal knowledge 2023-04-05T04:00:00Z The 62-day standard was not met by any cancer type but the report said global shortages in the supply of radiotherapy isotopes resulted in many patients not meeting the target. Scottish cancer waiting times performance at record low 2023-04-04T04:00:00Z The isotopes also show it was fed corn, a wintertime staple for Plains people. Horse nations: Animal began transforming Native American life startlingly early 2023-03-29T04:00:00Z For relatively minor changes to old weapons—new fuses, fresh top-ups of the hydrogen isotope tritium—that has been enough. Trust but verify: Can the U.S. certify new nuclear weapons without detonating them? 2023-04-20T04:00:00Z Working ring by ring, she sliced out tiny wood chips from the cedar and ran them through an accelerator mass spectrometer to determine the ratio of 14C to stable carbon isotopes. Marking time: Cosmic ray storms can pin precise dates on history from ancient Egypt to the Vikings 2023-04-13T04:00:00Z Tritium is a radioactive isotope of hydrogen that occurs naturally and is a common byproduct of nuclear plant operations. Minnesota nuclear plant shuts down for leak; residents worry 2023-03-24T04:00:00Z The depleted uranium is still radioactive but has a much lower level of the isotopes U-235 and U-234 - way less than the levels in natural uranium ore - reducing its radioactivity. Explainer: What are depleted uranium weapons - and what are the risks? 2023-03-23T04:00:00Z The isotope can last in detectable quantities for up to 300 years. Search Intensifies for Radioactive Canister Missing for Weeks in Thailand 2023-03-17T04:00:00Z Atoms in its metallic lattice are knocked out of place as it spits out uranium isotopes. Trust but verify: Can the U.S. certify new nuclear weapons without detonating them? 2023-04-20T04:00:00Z Rather than lodging in living tissue, these isotopes are washed to the surface in rain and snow, and they can end up in the annual layers of polar ice sheets. Marking time: Cosmic ray storms can pin precise dates on history from ancient Egypt to the Vikings 2023-04-13T04:00:00Z Tritium is a radioactive isotope of hydrogen that occurs naturally in the environment and is a common by-product of nuclear plant operations. Regulators monitor tritium leak at Minnesota nuclear plant 2023-03-16T04:00:00Z Wu and Shaknov packed the copper isotope into a tiny capsule, eight millimeters long, and waited for electrons and positrons to collide inside the apparatus. The Little-Known Origin Story behind the 2022 Nobel Prize in Physics 2023-03-16T04:00:00Z It will be also diluted, along with other radioactive isotopes, they say. What’s happening at Fukushima plant 12 years after meltdown? 2023-03-09T05:00:00Z The 1986 accident deposited the deadly radioactive isotope cesium-137 at levels 10 to 400 times higher near the power plant than in the city of Chernobyl, just 15 kilometres away. What Chernobyl’s Stray Dogs Could Teach Us about Radiation 2023-03-06T05:00:00Z Her goal was to measure the amount of carbon 14—a radioactive isotope of carbon commonly used to date archaeological artifacts. Mystery of Ancient Space Superstorms Deepens 2023-03-06T05:00:00Z This practice involves bombarding a sample with neutrons so that some of the sample's atoms will absorb the neutrons and thereby become unstable isotopes. The unsolved mystery of the president who may have been assassinated with arsenic 2023-03-05T05:00:00Z In the lab, Wu and Shaknov used it to bombard a sheet of copper with deuterons, generating an unstable isotope, Cu 64, as a source of positrons—the antimatter. The Little-Known Origin Story behind the 2022 Nobel Prize in Physics 2023-03-16T04:00:00Z The researchers then analyzed chemical signatures —isotopes of carbon and nitrogen—in the skin samples and matched the signatures to isotope ratios mapped across the Southern Ocean over the past 30 years. News at a glance: Monkey shipments, a controversial visa, and support for geoengineering research 2023-03-01T05:00:00Z This is achieved by using centrifuges - machines which spin at supersonic speeds - to separate out the most suitable isotope for nuclear fission, called U-235. Iran nuclear: IAEA inspectors find uranium particles enriched to 83.7% 2023-03-01T05:00:00Z But that denouement isn’t because of the radioactive decay of the isotope, which occurs across millennia rather than decades. Mystery of Ancient Space Superstorms Deepens 2023-03-06T05:00:00Z As the isotopes destabilize, they emit gamma rays which can be measured with a high-resolution gamma spectrometer. The unsolved mystery of the president who may have been assassinated with arsenic 2023-03-05T05:00:00Z In each sample, Derville, Carroll, and their colleagues measured the amounts of various carbon and nitrogen isotopes, forms of the elements with different numbers of neutrons and thus distinct masses. Whale skin provides clues to elusive migration habits 2023-02-26T05:00:00Z Whales eat krill and copepods bearing those isotopes, which turn up in fresh whale skin by about 6 months later, creating a record of the whales’ past travels. News at a glance: Monkey shipments, a controversial visa, and support for geoengineering research 2023-03-01T05:00:00Z Australia’s only atomic reactor is in the Sydney suburb of Lucas Heights where it produces nuclear isotopes for medical use. Albanese says Australian nuclear subs benefit US, UK 2023-02-21T05:00:00Z Some researchers have turned to ice core records to look for beryllium 10 and chlorine 36—two isotopes that, like radiocarbon, are produced in the atmosphere by high-energy phenomena. Mystery of Ancient Space Superstorms Deepens 2023-03-06T05:00:00Z In 2015, Seoul’s Food and Drug Safety Ministry found high levels of radioactive cesium isotopes in North Korea-produced dried hedgehog mushrooms that were being sold as Chinese products. Group urges radiation tests for 900 North Korean escapees 2023-02-21T05:00:00Z The ratios of these isotopes can be a fingerprint for a marine location, as the ratios vary from place to place, and over time in ocean water. Whale skin provides clues to elusive migration habits 2023-02-26T05:00:00Z Most experimental fusion reactors use the hydrogen isotopes deuterium and tritium. News at a glance: Monkey shipments, a controversial visa, and support for geoengineering research 2023-03-01T05:00:00Z In 2015, South Korea’s food safety agency detected nine times the standard level of radioactive cesium isotopes in mushrooms that had been smuggled from North Korea and sold in South Korea disguised as Chinese produce. Are North Korea’s Nuclear Weapons Tests as Safe as the Country Claims? 2023-02-21T05:00:00Z Andrew Smith, a physicist at the Australian Nuclear Science and Technology Organization, studies such isotopes in Antarctic ice cores. Mystery of Ancient Space Superstorms Deepens 2023-03-06T05:00:00Z In 2015, South Korea's food safety agency detected nine times the standard level of radioactive cesium isotopes in imported hedgehog mushrooms that had been sold as Chinese produce though their actual origin was North Korea. Groundwater carries radiation risk for North Korean cities near nuke test site, rights group says 2023-02-21T05:00:00Z Inspectors need to determine whether Iran intentionally produced the material, or whether the concentration was an unintended accumulation within the network of pipes connecting the hundreds of fast-spinning centrifuges used to separate the isotopes. Iran nuclear inspectors detect uranium enriched to 84% purity 2023-02-19T05:00:00Z In a 2016 study in a Swiss forest, researchers sprayed some trees’ leaves with a particular isotope of carbon and found that isotope showed up in unsprayed neighbors. Do Trees Really Support Each Other through a Network of Fungi? 2023-02-13T05:00:00Z Americium-241, an isotope that emits gamma and beta rays as it decays, is found in homes around the world in an unassuming device: a fire alarm. Australia radioactive capsule: Missing material more common than you think 2023-02-03T05:00:00Z A meteorite that landed in an English driveway has been found to contain water with a ratio of hydrogen isotopes resembling Earth’s. Science News Briefs from around the World: February 2023 2023-01-29T05:00:00Z “It’s burning deuterium,” he says, referring to a hydrogen isotope that achieves starlight-powering nuclear fusion at lower temperatures than normal hydrogen. JWST Heralds a New Dawn for Exoplanet Science 2023-01-23T05:00:00Z With only two isotopes, it was impossible to confirm that what the team saw reflected the chemical makeup of the primordial disk. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z In Kharkiv last March, Russian forces shelled the Institute of Physics and Technology, damaging a nuclear facility it had used for research and the production of medical isotopes. Ukraine’s Scientists Receive a Funding Lifeline From Abroad 2023-01-25T05:00:00Z They use the difference between two different types of oxygen isotopes found in the ice to calculate temperature, using an already established formula that is checked against observed data. New ice core analysis shows sharp Greenland warming spike 2023-01-18T05:00:00Z Certain isotopes emit radiation that can be harmful to humans, and the metal itself is toxic if ingested or inhaled. Man arrested after uranium found at UK's Heathrow Airport 2023-01-15T05:00:00Z The water is filtered for most radioactive isotopes, but the level of tritium is above the national standard, operator Tepco said. Fukushima nuclear disaster: Japan to release radioactive water into sea this year 2023-01-13T05:00:00Z And so Nie and her team measured all three potassium isotopes in 32 meteorites. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z What we do get is a heavier isotope of the same element—a nucleus containing the same number of protons but a different number of neutrons. How Star Collisions Forge the Universe’s Heaviest Elements 2023-01-09T05:00:00Z Examining the chemical isotopes in each layer, Johnson and her colleagues can get an idea of what kinds of foods the salmon were eating and when. California's endangered salmon population plummets amid new threat 2023-01-03T05:00:00Z Almost all radioactive particles will be removed from the wastewater before it is released, except for a hydrogen isotope called tritium that Japanese experts and others say poses a relatively low health risk. In the Pacific, Outcry Over Japan’s Plan to Release Fukushima Wastewater 2022-12-30T05:00:00Z Carbon isotopes are really a meter of the quantity of life on the planet. The Medea Hypothesis: Does life on Earth sow the seeds of its own extinction? 2022-12-19T05:00:00Z Three other teams have found a similar signal in the five stable isotopes of zinc. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z This heavy isotope is often unstable and radioactive. How Star Collisions Forge the Universe’s Heaviest Elements 2023-01-09T05:00:00Z The energy is converted to X-rays that compress and heat hydrogen isotopes called deuterium and tritium in the fuel capsule. See how lasers led to a nuclear fusion milestone That’s when human populations, economic activity and greenhouse gas emissions began skyrocketing worldwide, leaving indelible traces: plutonium isotopes from nuclear explosions, nitrogen from fertilizers, ash from power plants. For Planet Earth, This Might Be the Start of a New Age 2022-12-17T05:00:00Z The lasers focused on a tiny fuel pellet composed of rare hydrogen isotopes that is not easy to manufacture in large quantities. Opinion | Historic advance in nuclear fusion is truly something to celebrate 2022-12-13T05:00:00Z The isotopes could hold clues—and not just for our Solar System. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z A nucleus can rapidly balloon into a highly unstable isotope, going all the way up to what’s called the neutron drip line—the absolute limit of the neutron-to-proton ratio allowed by nature inside a nucleus. How Star Collisions Forge the Universe’s Heaviest Elements 2023-01-09T05:00:00Z The pulse of energy caused the capsule to collapse, creating temperatures only seen in stars and thermonuclear weapons, and the hydrogen isotopes fused into helium, releasing additional energy and creating a cascade of fusion reactions. Nuclear Fusion Lab Achieves ‘Ignition’: What Does It Mean? 2022-12-13T05:00:00Z Doubly labeled water is the gold standard for measuring daily energy expenditures, but it’s expensive, and you need a specialized lab for the isotope analyses. New Human Metabolism Research Upends Conventional Wisdom about How We Burn Calories 2022-12-13T05:00:00Z This facility, called the Neutron Source, would generate medical isotopes and beams of neutrons for probing materials. Hero city: Crippled by Russian attacks, Ukraine’s science hotbed refuses to give up 2022-12-06T05:00:00Z But that view was challenged by studies that tallied the ratios of certain isotopes found in the dozens of known species of meteorite. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z Every isotope of every element in the periodic table has the potential to tell us something about the nuclear history of the universe. How Star Collisions Forge the Universe’s Heaviest Elements 2023-01-09T05:00:00Z Miami Dade does not have an operational mass spectrometer, suggesting McKinney would have had to perform the isotope analyses underlying the paper at another facility. Paleontologist accused of faking data in dino-killing asteroid paper 2022-12-06T05:00:00Z A beam of particles passes through the interior of the chamber silently at around half the speed of light until it smashes into a solid piece of material, resulting in a burst of rare isotopes. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Research involved people drinking a glass of water in which some of the hydrogen molecules were replaced by a stable isotope of the element called deuterium. Scientists say eight glasses of water a day may be too much 2022-11-25T05:00:00Z A close match between the isotope ratios found in noncarbonaceous chondrites and those found in the same metals on Earth suggested much of Earth’s raw material came from the same nearby region as those meteorites. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z But by studying oxygen isotopes in rainwater throughout the Amazon, Salati found that about half of the precipitation was recycled. As the Amazon rainforest goes dry, a desperate wait for water If the data were generated in a stable isotope lab, “that lab had a desktop computer that recorded results,” he says, and they should still be available. Paleontologist accused of faking data in dino-killing asteroid paper 2022-12-06T05:00:00Z We are two professors in nuclear chemistry and nuclear physics who study rare isotopes. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z But scientists have now collaborated across the world to measure exact water turnover using a stable isotope technique. Scientists say eight glasses of water a day may be too much 2022-11-25T05:00:00Z Using a prenatal diet of hallucinogens, speed and radioactive isotopes, the couple produce their mutant progeny: conjoined twins; Aqua Boy; a hunchback; a seemingly typical child with telekinesis; stillborn infants exhibited in jars. Review | ‘Geek Love’ put Katherine Dunn on the map. Was it her sole masterpiece? 2022-11-11T05:00:00Z To identify Hanks's remains, scientists used anthropological and isotope analysis, as well as circumstantial evidence. Remains of US soldier Tommie Hanks identified after 72 years 2022-11-11T05:00:00Z But proportionally the biggest winner is the tiny isotope R&D and production program, which aims to revitalize the United States’s ability to generate rare isotopes for myriad research uses. Some labs, projects win big as Department of Energy disburses extra funds 2022-11-09T05:00:00Z It takes incredibly high amounts of energy to produce most isotopes. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z His team tracked carbon isotopes from one tree to the roots of other nearby trees, including different species, in an experimental forest plot. Are Trees Talking Underground? For Scientists, It’s In Dispute. 2022-11-07T05:00:00Z Methane emitted by fossil sources has more of the carbon-13 isotope than that produced from wetlands or cattle. Climate-warming methane emissions rising faster than ever, study says 2022-10-26T04:00:00Z With more than double the 13 neutrons in natural sodium, the neutron-rich isotope of the element is so extreme that few theoretical models predicted its existence. It may be possible to cram more neutrons into atomic nuclei than previously thought 2022-10-26T04:00:00Z A report released earlier this month by Boston Chemical Data Corp. cited levels of radioactive isotope lead-210 that were 22 times the expected level on the kindergarten playground. Corps to conduct further testing at contaminated school 2022-10-20T04:00:00Z In nature, heavy rare isotopes are produced during the cataclysmic deaths of massive stars called supernovas or during the merging of two neutron stars. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z While other studies had also indicated that neanderthals ate a lot of meat, none had utilized the zinc isotope method. Were neanderthals meat-eaters? A new study provides strongest evidence yet that they were 2022-10-20T04:00:00Z “The isotope data suggest it’s biological rather than fossil methane from gas leaks. It could be from agriculture,” Jackson said. Climate-warming methane emissions rising faster than ever, study says 2022-10-26T04:00:00Z It found levels of radioactive isotope lead-210 that were 22 times the expected level on the kindergarten playground. Medical guidance sought after contamination closes school 2022-10-19T04:00:00Z The Boston Chemical study cited levels of radioactive isotope lead-210 that were 22 times the expected level on the kindergarten playground. Radioactive waste finding raises worries at Missouri school 2022-10-18T04:00:00Z To the naked eye, two isotopes of any element look and behave the same way — all isotopes of the element mercury would look just like the liquid metal used in old thermometers. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z By successfully using zinc isotopes to measure meat consumption among neanderthals, the researchers hope they have pioneered a new method for addressing questions about neanderthal diets. Were neanderthals meat-eaters? A new study provides strongest evidence yet that they were 2022-10-20T04:00:00Z Using techniques to measure the presence of an isotope called carbon-14, the researchers found that most of the captured ivory was from elephants killed within the previous three years. Ivory seized decades ago still turning up in raids 2022-10-17T04:00:00Z The report found significant levels of radioactive isotope lead-210, polonium, radium and other toxins when researchers took samples from the school in August, according to the St. Louis Dispatch. Radioactive contamination found at elementary school in St. Louis suburbs 2022-10-17T04:00:00Z Levels of the radioactive isotope lead-210, polonium, radium and other toxins were “far in excess” of what Boston Chemical had expected. Radioactive waste found at Missouri elementary school 2022-10-16T04:00:00Z However, because the nuclei of isotopes of the same element have different numbers of neutrons, they differ in how long they live, what type of radioactivity they emit and in many other ways. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z While other studies had also indicated that neanderthals ate a lot of meat, none had utilized the zinc isotope method. Were neanderthals meat-eaters? A new study provides strongest evidence yet that they were 2022-10-20T04:00:00Z Radiocarbon dating estimates the age of organic objects such as bones and charcoal based on the steady radioactive decay of their carbon-14 isotopes. Modern humans and Neanderthals may have overlapped, shared culture in Western Europe 2022-10-13T04:00:00Z Chemical isotopes in the mercenaries’ bones indicated that the soldiers were born far away and that their parents and grandparents were not immigrants. Paid to Fight, Even in Ancient Greece 2022-10-04T04:00:00Z Chemical isotopes in their bones confirmed they were born far away, ruling out the possibility that they were second- or third-generation descendants of immigrants. Mercenaries may have helped ancient Greeks turn the tide of war 2022-10-02T04:00:00Z For example, some isotopes are stable and do not decay or emit radiation, so they are common in the universe. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z As the authors explain, large herbivores usually have higher proportions of zinc isotope ratios in their bones than carnivores, and this neanderthal's scores were "substantially lower than that of the lowest carnivore's value." Were neanderthals meat-eaters? A new study provides strongest evidence yet that they were 2022-10-20T04:00:00Z Anything living at the time incorporated extra amounts of the isotope as a result, throwing off modern efforts to radiocarbon date their remains. Modern humans and Neanderthals may have overlapped, shared culture in Western Europe 2022-10-13T04:00:00Z The pollution that infests those systems can include everything from silt and natural debris to asbestos, heavy metals, radioactive isotopes and other harmful contaminants released when man-made structures burn. How New Mexico’s Largest Wildfire Set Off a Drinking Water Crisis 2022-09-26T04:00:00Z Japan's Foreign Ministry said at that time that regulators deemed it safe to release the water, which will still contain traces of the radioactive isotope tritium after treatment. At U.N., Micronesia denounces Japan plan to release Fukushima water into Pacific 2022-09-23T04:00:00Z Other isotopes of the very same element can be radioactive so they inevitably decay away as they turn into other elements. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Researchers will want to see whether they contain more of the light isotopes of carbon that life prefers, says Chris Herd, a planetary geologist on the rover team at the University of Alberta, Edmonton. Mars rover nears milestone in ambitious plan to to return first rocks from another planet 2022-09-20T04:00:00Z Dr. Scherer analyzes human bones and anything to do with diet, isotopes and burials. Unearthing a Maya Civilization That ‘Punched Above its Weight’ 2022-09-13T04:00:00Z A fusion power plant would be fueled with a mix of the hydrogen isotopes deuterium and tritium, which react most readily. Twisty device explores alternative path to fusion 2022-09-06T04:00:00Z Now, by measuring rare oxygen isotopes, a team of geochemists has developed a way to deduce long-ago global temperatures 10 kilometers up in the atmosphere, creating, in effect, a paleo–weather balloon. Ice age ‘weather balloon’ probes ancient temperatures high in the atmosphere 2022-09-05T04:00:00Z Since radioactive isotopes disappear over time, they are relatively rarer. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z The Lucas Heights reactor in Sydney produces nuclear isotopes for medical use. UK minister vows wide-ranging support for Australian subs 2022-09-01T04:00:00Z Potassium iodide is taken to prevent radioactive iodine - the main cancer-causing isotope also known as iodine-131 - from being absorbed by the thyroid gland. Zaporizhzhia nuclear plant: EU provides anti-radiation tablets to Ukraine 2022-08-30T04:00:00Z They also show a strong increase in the prevalence of a certain variant of carbon, called an isotope, that these small organisms were busily molding into their shells. Report of an ancient methane release raises questions for our climate future 2022-08-24T04:00:00Z Analysis of radioactive isotopes provided precise dating of various regions of the moon’s surface. Why NASA Is Going Back to the Moon 2022-08-28T04:00:00Z Some radioactive elements — like potassium-40 — emit particles through decay at such a low rate that a small amount of the isotope can last for billions of years. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z But a 2011 academic study using carbon isotopes to distinguish wild from captive wolves suggested that at least three wild wolves were living in Vermont and New York in the previous decade. Cry wolf? Debate over presence of wolves in Northeast 2022-08-26T04:00:00Z In medicine, mass spectrometers are used to measure the concentration of isotopes used as tracers. College Physics for AP Courses 2015-08-12T00:00:00Z A small amount of solid silver sulfate containing a radioactive isotope of silver is added to this solution. Chemistry 2019-02-14T00:00:00Z The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Biology for AP Courses 2022-06-09T00:00:00Z Other, more highly radioactive isotopes like magnesium-38 exist for only a fraction of a second before decaying away into other elements. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z What are the three isotopes of hydrogen, and how do they differ? Astronomy 2016-10-13T00:00:00Z Why do different isotopes of the same element have similar chemistries? College Physics for AP Courses 2015-08-12T00:00:00Z To illustrate this concept, consider the decay of radioactive isotopes, a topic more thoroughly treated in the chapter on nuclear chemistry. Chemistry 2019-02-14T00:00:00Z K-41 is one of the naturally occurring isotopes of potassium. Biology for AP Courses 2022-06-09T00:00:00Z Short-lived isotopes, by definition, do not survive long and are rare in the universe. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Geologists estimate that about half of Earth’s current internal heat budget comes from the decay of radioactive isotopes in its interior. Astronomy 2016-10-13T00:00:00Z A favorite isotope in physics labs, since it has a short half-life and decays to a stable nuclide. College Physics for AP Courses 2015-08-12T00:00:00Z The chemical properties of the different isotopes are very similar because they have identical electron structures, but they differ in some physical properties because of their differing atomic masses. Chemistry 2019-02-14T00:00:00Z The DNA and protein of the virus were tagged with different isotopes and exposed to host cell where only the DNA was transferred to the host. Biology for AP Courses 2022-06-09T00:00:00Z Scientists have used particle accelerators to produce around 3,000 of these rare isotopes. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Grains of interstellar dust are found in meteorites and can be identified because the abundances of certain isotopes are different from what we see in other solar system material. Astronomy 2016-10-13T00:00:00Z Among the things to consider are the isotope chosen, its half-life and decay energy, the power needs of the probe and the length of the flight. College Physics for AP Courses 2015-08-12T00:00:00Z Consequently, when liquid hydrogen evaporates, the heavier isotopes are concentrated in the last portions to evaporate. Chemistry 2019-02-14T00:00:00Z As time passed, the number of atoms of this isotope changed to N87Rb. Biology for AP Courses 2022-06-09T00:00:00Z To create radioactive isotopes, you only need to smash this beam of ions into a solid target like a piece of beryllium metal or a rotating disk of carbon. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Yet, by making the Moon primarily of terrestrial mantle material, it is also possible to understand similarities such as identical abundances of various oxygen isotopes. Astronomy 2016-10-13T00:00:00Z Many organs can be imaged with a variety of nuclear isotopes replacing a stable element by a radioactive isotope. College Physics for AP Courses 2015-08-12T00:00:00Z Note that all isotopes of elements with atomic numbers greater than 83 are unstable. Chemistry 2019-02-14T00:00:00Z The higher the isotope concentration, the higher the average temperature of the ocean. Biology for AP Courses 2022-06-09T00:00:00Z The impact of the ion beam on the fragmentation target breaks the nucleus of the stable isotope apart and produces many hundreds of rare isotopes simultaneously. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z You can think of isotopes as siblings in the same element “family”—closely related but with different characteristics and behaviors. Astronomy 2016-10-13T00:00:00Z Note that there is more than one isotope that can be used for several types of scans. College Physics for AP Courses 2015-08-12T00:00:00Z In all three series, the end-product is a stable isotope of lead. Chemistry 2019-02-14T00:00:00Z Isotopes are different forms of an element that have different numbers of neutrons while retaining the same number of protons; many isotopes, such as carbon-14, are radioactive. Biology for AP Courses 2022-06-09T00:00:00Z To isolate the interesting or new isotopes from the rest, a separator sits between the target and the sensors. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z The most common isotope of hydrogen is the one with only a single proton and no neutrons. Astronomy 2016-10-13T00:00:00Z One of the methods used to limit radiation dose to the patient in medical imaging is to employ isotopes with short half-lives. College Physics for AP Courses 2015-08-12T00:00:00Z Calculate the fraction of a sample of the isotope that will remain after 15 years. Chemistry 2019-02-14T00:00:00Z Since an element’s isotopes will have slightly different mass numbers, scientists also determine the atomic mass, which is the calculated mean of the mass number for its naturally occurring isotopes. Biology for AP Courses 2022-06-09T00:00:00Z Only a subset of the desired isotopes will reach the many instruments built to observe the nature of the particles. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Nuclei with the same number of protons but different numbers of neutrons are different isotopes of the same element. Astronomy 2016-10-13T00:00:00Z Several radioactive isotopes were released in huge quantities, contaminating many thousands of square kilometers and directly affecting hundreds of thousands of people. College Physics for AP Courses 2015-08-12T00:00:00Z The half-lives of a number of radioactive isotopes important to medicine are shown in Table 21.2, and others are listed in Appendix M. Chemistry 2019-02-14T00:00:00Z Some elements—such as carbon, potassium, and uranium—have naturally occurring isotopes. Biology for AP Courses 2022-06-09T00:00:00Z The probability of creating any specific isotope during a single collision can be very small. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z The ages of stony meteorites can be determined from the careful measurement of radioactive isotopes and their decay products. Astronomy 2016-10-13T00:00:00Z There is more than one isotope of natural uranium. College Physics for AP Courses 2015-08-12T00:00:00Z We will explore some of the most common types of radioactive dating and how the particular isotopes work for each type. Chemistry 2019-02-14T00:00:00Z The time it takes for half of the original concentration of an isotope to decay back to its more stable form is called its half-life. Biology for AP Courses 2022-06-09T00:00:00Z The odds of creating some of the rarer exotic isotopes can be on the order of 1 in a quadrillion — roughly the same odds as winning back-to-back Mega Millions jackpots. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z The biggest winner would be the DOE isotope R&D and production program, which last year became a separate program within the Office of Science. U.S. Department of Energy research gets a surprise boost in inflation-reduction bill 2022-08-09T04:00:00Z Look up the natural isotopes of uranium and their half-lives, and calculate the activity of such a vase assuming it has 2.00 g of uranium in it. College Physics for AP Courses 2015-08-12T00:00:00Z If there is additional lead-206 present, which is indicated by the presence of other lead isotopes in the sample, it is necessary to make an adjustment. Chemistry 2019-02-14T00:00:00Z Comparing the ratio of the 14C concentration found in an object to the amount of 14C detected in the atmosphere, the amount of the isotope that has not yet decayed can be determined. Biology for AP Courses 2022-06-09T00:00:00Z Even at one quarter of a percent of the facility's 400-kW maximum power, approximately 40 different isotopes passed through the separator to the instruments. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z The program provides a broad variety of rare isotopes used by researchers in fields ranging from archeology to quantum physics, as well as in industrial processes and for national security. U.S. Department of Energy research gets a surprise boost in inflation-reduction bill 2022-08-09T04:00:00Z Construct a problem in which you calculate the mass of a radioactive isotope you need in order to supply power for a long space flight. College Physics for AP Courses 2015-08-12T00:00:00Z Rutherford bombarded nitrogen atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons resulting from the reaction: Chemistry 2019-02-14T00:00:00Z Other elements have isotopes with different half lives. Biology for AP Courses 2022-06-09T00:00:00Z The FDSi device recorded the time each ion arrived, what isotope it was and when it decayed away. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z That yellowcake is turned into a gas, which is enriched with the isotope U-235. Why the US can’t quit Russian uranium 2022-08-09T04:00:00Z Doses from the Earth itself are mainly due to the isotopes of uranium, thorium, and potassium, and vary greatly by location. College Physics for AP Courses 2015-08-12T00:00:00Z Since then, fission has been observed in many other isotopes, including most actinide isotopes that have an odd number of neutrons. Chemistry 2019-02-14T00:00:00Z The DNA was tagged with an isotope, which was retained in the virus, proving it to be the genetic material. Biology for AP Courses 2022-06-09T00:00:00Z Using this information, the collaboration deduced the half-lives of the isotopes; the team has already reported on five previously unknown half-lives. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z This isotope is fissile, making it more efficient for nuclear fuel. Why the US can’t quit Russian uranium 2022-08-09T04:00:00Z Table 32.1 lists certain diagnostic uses of radiopharmaceuticals including the isotope and activity typically used in diagnostics. College Physics for AP Courses 2015-08-12T00:00:00Z After it is injected, the location of the technetium compound, and hence the damaged tissue, can be determined by detecting the γ rays emitted by the Tc-99 isotope. Chemistry 2019-02-14T00:00:00Z The viral protein was tagged with an isotope, and the host cell was infected by it. Biology for AP Courses 2022-06-09T00:00:00Z The facility accelerated a beam of selenium-82 and used it to produce rare isotopes of the elements scandium, calcium and potassium. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Certain stable isotopes, and the presence of trace elements, can help determine where a person grew up and what that person’s diet and health were like later in life. ‘What a Horrible Place This Would Have Been’ 2022-08-08T04:00:00Z It has been found that environmental activities of these two isotopes are decreasing faster than their half-lives. College Physics for AP Courses 2015-08-12T00:00:00Z Thus, the concept of isotopes, in which an element has different masses, was a violation of the original idea. Chemistry 2019-02-14T00:00:00Z As time passed, the number of each isotope changed from its initial value. Biology for AP Courses 2022-06-09T00:00:00Z These isotopes are commonly found in neutron stars, and the goal of the experiment was to better understand what type of radioactivity these isotopes emit as they decay. A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Of more than 60 isotopes selected for treatment, all but one — tritium — will be reduced to meet safety standards, they say. Construction begins at Fukushima plant for water release 2022-08-03T04:00:00Z In recent years, scientists have discovered iron-60 isotopes in ocean crust samples dating from 2 million to 3 million years ago. ‘Voyager on steroids.’ Mission would probe mysterious region beyond our Solar System 2022-07-27T04:00:00Z To account for the existence of isotopes, the second postulate of his atomic theory was modified to state that atoms of the same element must have identical chemical properties. Chemistry 2019-02-14T00:00:00Z The ratio of the initial number of 87Sr and 86Sr atoms is the same as today, since the isotopes are both stable. Biology for AP Courses 2022-06-09T00:00:00Z Finally, how can the information from rare isotopes be applied in medicine, industry and national security? A particle accelerator that just turned on could reveal rare forms of matter 2022-11-26T05:00:00Z Scientists say the impact of long-term, low-dose exposure to not only tritium but also other isotopes on the environment and humans are still unknown and that a release is premature. Construction begins at Fukushima plant for water release 2022-08-03T04:00:00Z Initially there are 9 grams of the isotope present. Calculus, Volume 1 2016-03-30T00:00:00Z Other answers for this exercise are possible if a different element of isotope is chosen. Chemistry 2019-02-14T00:00:00Z Tepco plans to filter the contaminated water to remove harmful isotopes apart from tritium, which is hard to remove. Japan regulators approve release of Fukushima water into sea 2022-07-22T04:00:00Z This contributes to a long standing technical inquiry into the source of Iceland’s mysteriously low levels of oxygen-18, an isotope often found in volcanic rock. Reaching Closer to Earth’s Core, One Lava Scoop at a Time 2022-07-22T04:00:00Z We use half-life in applications involving radioactive isotopes. Algebra and Trigonometry 2015-02-13T00:00:00Z The declared purpose of the enrichment process at its underground facility at Fordow is to create uranium isotope enriched up to 20 percent — far below the 90 percent enrichment levels necessary to create weapons-grade uranium. Final act of empire? U.S., Israel and the Saudis now heading for war with Iran 2022-07-19T04:00:00Z Since 1961, it has been defined with regard to the most abundant isotope of carbon, atoms of which are assigned masses of exactly 12 amu. Chemistry 2019-02-14T00:00:00Z Isotopes Atoms of the same element that contain different numbers of neutrons are called isotopes. Miller & Levine Biology 2018-01-01T00:00:00Z Dr. Bindeman said that scientists have been debating for more than half a century whether this can be attributed to a lack of the isotope in the mantle. Reaching Closer to Earth’s Core, One Lava Scoop at a Time 2022-07-22T04:00:00Z As long as a plant or animal is alive, the ratio of the two isotopes of carbon in its body is close to the ratio in the atmosphere. Algebra and Trigonometry 2015-02-13T00:00:00Z Some elements, such as carbon, potassium, and uranium, have naturally occurring isotopes. Environmental Biology 2018-09-06T00:00:00Z Element 109 was named in honor of Lise Meitner, who discovered nuclear fission, a phenomenon that would have world-changing impacts; Meitner also contributed to the discovery of some major isotopes, discussed immediately below. Chemistry 2019-02-14T00:00:00Z Since isotopes have a different number of neutrons, their masses differ and they are identified by their mass numbers. Miller & Levine Biology 2018-01-01T00:00:00Z A clastic sedimentary rock is made up of older rock and mineral fragments, and when the rock forms it is almost certain that all of the fragments already have daughter isotopes in them. Physical Geology 2015-01-01T00:00:00Z In this section, we explore some important applications in more depth, including radioactive isotopes and Newton’s Law of Cooling. Algebra and Trigonometry 2015-02-13T00:00:00Z Carbon 12, the most common isotope of carbon, contains six protons and six neutrons. Environmental Biology 2018-09-06T00:00:00Z How many protons, neutrons, and electrons are in atoms of these isotopes? Chemistry 2019-02-14T00:00:00Z The radiation can be dangerous, but there are important uses for radioactive isotopes. Miller & Levine Biology 2018-01-01T00:00:00Z It might be possible to date some chemical sedimentary rocks isotopically, but there are no useful isotopes that can be used on old chemical sedimentary rocks. Physical Geology 2015-01-01T00:00:00Z Every radioactive isotope has a half-life, and the process describing the exponential decay of an isotope is called radioactive decay. Algebra and Trigonometry 2015-02-13T00:00:00Z These two alternate forms of carbon are isotopes. Environmental Biology 2018-09-06T00:00:00Z Write the complete electron configuration for each isotope. Chemistry 2019-02-14T00:00:00Z Determining the timing of geological history by using radioactive isotopes, which decay at a steady rate, is called radiometric dating. Miller & Levine Biology 2018-01-01T00:00:00Z The most common isotope of uranium has 92 protons and 146 neutrons. Physical Geology 2015-01-01T00:00:00Z It compares the difference between the ratio of two isotopes of carbon in an organic artifact or fossil to the ratio of those two isotopes in the air. Algebra and Trigonometry 2015-02-13T00:00:00Z Some isotopes are unstable and will lose protons, other subatomic particles, or energy to form more stable elements. Environmental Biology 2018-09-06T00:00:00Z Radioactive decay is by definition a spontaneous process in which the nuclei of unstable isotopes emit radiation as they are converted to more stable nuclei. Chemistry 2019-02-14T00:00:00Z To determine which part of the virus entered the bacterium, Hershey and Chase grew viruses with radioactive isotopes. Miller & Levine Biology 2018-01-01T00:00:00Z The new proton increases the element’s atomic number by one, forming a new element with the same atomic mass as the parent isotope. An Introduction to Geology 2017-01-01T00:00:00Z All of the isotopes of carbon have the same number of protons; therefore, 13C has seven neutrons, and 14C has eight neutrons. Anatomy and Physiology 2013-06-19T00:00:00Z The time it takes for half of the original concentration of an isotope to decay to its more stable form is called its half-life. Environmental Biology 2018-09-06T00:00:00Z All the decay processes occur spontaneously, but the rates at which different isotopes decay vary widely. Chemistry 2019-02-14T00:00:00Z Radioactive Isotopes Some isotopes have nuclei that are unstable and break down at a constant rate over time. Miller & Levine Biology 2018-01-01T00:00:00Z Notice these are all isotopes of different elements but they have the same atomic mass of 234. An Introduction to Geology 2017-01-01T00:00:00Z It is by far the most abundant isotope of hydrogen in nature. Anatomy and Physiology 2013-06-19T00:00:00Z Using the ratio of the 14C concentration found in an object to the amount of 14C detected in the atmosphere, the amount of the isotope that has not yet decayed can be determined. Environmental Biology 2018-09-06T00:00:00Z A plot of the number of neutrons versus the number of protons for stable nuclei reveals that the stable isotopes fall into a narrow band. Chemistry 2019-02-14T00:00:00Z However, that number roughly equals the background events expected from inevitable traces of radioactive isotopes such as lead-214 in the xenon and other sources, Lippincott reported, so LZ cannot claim it has detected WIMPs. Dark matter hunt heats up with first result from world’s biggest detector 2022-07-06T04:00:00Z The parent and daughter isotopes are separated out of the mineral using chemical extraction. An Introduction to Geology 2017-01-01T00:00:00Z An isotope that contains more than the usual number of neutrons is referred to as a heavy isotope. Anatomy and Physiology 2013-06-19T00:00:00Z Paleontologists can investigate dinosaur diets by looking at geochemical isotopes—versions of elements with different numbers of neutrons—found in fossilized bones. Dinosaur Diets May Help Explain Dramatic Diversity 2022-07-01T04:00:00Z Since then, hundreds of different isotopes have been observed among the products of fissionable substances. Chemistry 2019-02-14T00:00:00Z Researchers came up with the revised age by testing sediment around the fossils for levels of a rare isotope created when the rocks were exposed to cosmic rays - before they fell into the cave. Fossils: Cave woman one million years older than thought 2022-06-28T04:00:00Z This gives rise to the concept of 'isotope'. An Introduction to Geology 2017-01-01T00:00:00Z Heavy isotopes tend to be unstable, and unstable isotopes are radioactive. Anatomy and Physiology 2013-06-19T00:00:00Z As herbivorous dinosaurs digested ferns and conifers, for example, isotopes of oxygen, carbon and strontium from those plants accumulated in different proportions. Dinosaur Diets May Help Explain Dramatic Diversity 2022-07-01T04:00:00Z Similar fission reactions have been observed with other uranium isotopes, as well as with a variety of other isotopes such as those of plutonium. Chemistry 2019-02-14T00:00:00Z Ultra Safe has explored different isotopes, like cobalt-60 and thulium, which can be scaled to produce 10 times the energy of traditional plutonium systems while beingsafer and more cost-effective. 2 Seattle startups racing to transform next-gen space travel 2022-06-26T04:00:00Z Unstable isotopes, called radioactive isotopes, spontaneously decay over time releasing subatomic particles or energy in a process called radioactive decay. An Introduction to Geology 2017-01-01T00:00:00Z Excessive exposure to radioactive isotopes can damage human cells and even cause cancer and birth defects, but when exposure is controlled, some radioactive isotopes can be useful in medicine. Anatomy and Physiology 2013-06-19T00:00:00Z Horned and armored dinosaurs walked on all fours with their heads near the ground, and isotope ratios show these dinosaurs ate low-growing plants in a relatively limited geographic area. Dinosaur Diets May Help Explain Dramatic Diversity 2022-07-01T04:00:00Z The unstable nuclei and the transuranium isotopes give the spent fuel a dangerously high level of radioactivity. Chemistry 2019-02-14T00:00:00Z Samples of ancient plankton shells seemed to show the atmosphere during the brief hothouse was enriched in light carbon, the isotope favored by life. Hidden carbon layer may have sparked ancient bout of global warming 2022-06-23T04:00:00Z However, some rock specimens have an enormous number of radioactive isotopes, perhaps trillions of atoms and this large group of radioactive isotopes do have a predictable pattern of radioactive decay. An Introduction to Geology 2017-01-01T00:00:00Z An isotope is one of the different forms of an element, distinguished from one another by different numbers of neutrons. Anatomy and Physiology 2013-06-19T00:00:00Z This wasn’t ordinary hydrogen but its rare radioactive isotope tritium, in which two neutrons and a proton cling together in the nucleus. Fusion power may run out of fuel before it even gets started 2022-06-22T04:00:00Z Besides, is a stable isotope, and decays by beta emission. Chemistry 2019-02-14T00:00:00Z Iran maintains that its nuclear program is for peaceful purposes, like producing medical isotopes to diagnose and treat disease. Trump’s Shadow Looms Over Fading Iran Nuclear Talks 2022-06-18T04:00:00Z The radioactive decay of half of the radioactive isotopes in this group takes a specific amount of time. An Introduction to Geology 2017-01-01T00:00:00Z A radioactive isotope is an isotope whose nucleus readily decays, giving off subatomic particles and electromagnetic energy. Anatomy and Physiology 2013-06-19T00:00:00Z Nuclei in the structures sometimes absorb the neutrons, creating radioactive isotopes that do further damage. Fusion power may run out of fuel before it even gets started 2022-06-22T04:00:00Z The radioactive isotope is contained in tubes called fuel rods. Chemistry 2019-02-14T00:00:00Z This migratory detective work focused on strontium and oxygen isotopes in the tusks. Fred the Mastodon’s Tusks Reveal a Life of Fighting and Roaming 2022-06-13T04:00:00Z First, the mineral grains containing the isotope formed at the same time as the rock, such as minerals in an igneous rock that crystallized from magma. An Introduction to Geology 2017-01-01T00:00:00Z Different versions of an element are called isotopes. Anatomy and Physiology 2013-06-19T00:00:00Z The isotopes are then separated and fed back into the reactor. Fusion power may run out of fuel before it even gets started 2022-06-22T04:00:00Z For example, magnesium exists as a mixture of three isotopes, each with an atomic number of 12 and with mass numbers of 24, 25, and 26, respectively. Chemistry 2019-02-14T00:00:00Z Joshua Miller, a paleoecologist from the University of Cincinnati and an author of the study, described strontium isotopes as leaving signals all over the landscape. Fred the Mastodon’s Tusks Reveal a Life of Fighting and Roaming 2022-06-13T04:00:00Z The radioactive decay product of an element is called its daughter isotope and the original element is called the parent isotope. An Introduction to Geology 2017-01-01T00:00:00Z Scientists used traces of chemical isotopes from the individuals’ teeth to determine their status as Medieval ramblers. Science News Briefs from around the World: June 2022 2022-06-06T04:00:00Z One critical factor the authors identified is reactor downtime, when tritium breeding stops but the isotope continues to decay. Fusion power may run out of fuel before it even gets started 2022-06-22T04:00:00Z These isotope symbols are read as “element, mass number” and can be symbolized consistent with this reading. Chemistry 2019-02-14T00:00:00Z Strontium isotopes leach from rocks into surrounding soil and water. Fred the Mastodon’s Tusks Reveal a Life of Fighting and Roaming 2022-06-13T04:00:00Z The half-life of 238U is 4.5 billion years, i.e., the time it takes for half of the parent isotope atoms to decay into the daughter isotope. An Introduction to Geology 2017-01-01T00:00:00Z In the latest study, international researchers used zinc isotopes in the teeth of living and extinct sharks as a tool to understand the diet of long-dead animals. Megalodon shark extinction may have been linked to great white competition 2022-05-31T04:00:00Z But Federici doesn’t think the agency, or militaries around the world, will get into the business of selling the isotope. Fusion power may run out of fuel before it even gets started 2022-06-22T04:00:00Z Information about the naturally occurring isotopes of elements with atomic numbers 1 through 10 is given in Table 2.4. Chemistry 2019-02-14T00:00:00Z Interpreting these geographical references and matching them onto the landscape takes one more step: a map of how strontium isotopes change across terrain. Fred the Mastodon’s Tusks Reveal a Life of Fighting and Roaming 2022-06-13T04:00:00Z This isotope of uranium, 238U, can be used for absolute dating the oldest materials found on Earth, and even meteorites and materials from the earliest events in our solar system. An Introduction to Geology 2017-01-01T00:00:00Z When previous paleontologists attempted to learn if dinosaurs were warm-blooded, they looked for growth rings or chemical isotope signals in the blood, both of which are less reliable because they can alter during fossilization. Were dinosaurs warm- or cold-blooded? New study settles an old debate 2022-05-29T04:00:00Z Marilyn Fogel, a scientist dubbed the “isotope queen” for illuminating fundamental scientific questions through analysis of atomic isotope ratios, died May 11 at her home in Mariposa, Calif. She was 69. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z Note that in addition to standard names and symbols, the isotopes of hydrogen are often referred to using common names and accompanying symbols. Chemistry 2019-02-14T00:00:00Z Oxygen isotopes helped to uncover the seasons in which Fred migrated. Fred the Mastodon’s Tusks Reveal a Life of Fighting and Roaming 2022-06-13T04:00:00Z Studies of deep-sea sediment use stable carbon and oxygen isotopes obtained from the shells of deep-sea benthic foraminifera that have settled on the ocean floor over millions of years. An Introduction to Geology 2017-01-01T00:00:00Z Unlike Earth, the moon may contain large amounts of helium-3, an isotope potentially useful as an alternative to uranium for nuclear power plants because it’s not radioactive. China, U.S. are racing to make billions from mining the moon’s minerals 2022-05-21T04:00:00Z Dr. Fogel spent much of her career at the Carnegie Institution for Science in Washington, where she pioneered the use of isotope ratios in the relatively new field of biogeochemistry. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z However, the average masses of atoms of most elements are not whole numbers because most elements exist naturally as mixtures of two or more isotopes. Chemistry 2019-02-14T00:00:00Z Each time it rained, atmospheric isotopes recording the season were incorporated into local bodies of water and ingested when he drank from nearby ponds and streams. Fred the Mastodon’s Tusks Reveal a Life of Fighting and Roaming 2022-06-13T04:00:00Z Oxygen isotopes are collected from these annual layers and the ratio of 18O to 16O is used to determine temperature as discussed above. An Introduction to Geology 2017-01-01T00:00:00Z Marilyn Fogel, 69, a scientist dubbed the “isotope queen” for illuminating fundamental scientific questions through analysis of atomic isotope ratios, died May 11 at her home in Mariposa, California. This week’s passages 2022-05-20T04:00:00Z In her work, Dr. Fogel inferred the story of significant events in the history of living creatures through changes in the ratios of the isotopes of their atoms. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z This is equal to the sum of each individual isotope’s mass multiplied by its fractional abundance. Chemistry 2019-02-14T00:00:00Z Tepco plans to filter the contaminated water to remove isotopes, leaving only tritium, a radioactive isotope of hydrogen hard to separate from water. Japan nuclear regulator grants initial nod to Fukushima water release plan 2022-05-18T04:00:00Z There are usually several isotopes for a particular element. An Introduction to Geology 2017-01-01T00:00:00Z Samples were taken from six of the skeletons and isotope analysis of their bones concluded that one came from southern England, possibly Cornwall, another from southern Cornwall and a third from an urban English environment. Dutch 18th Century mass grave: Skeletons in Vianen were British soldiers 2022-05-10T04:00:00Z Behind many of her findings lay the concept of the isotope. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z What is the percent composition of Cl in terms of these two isotopes? Chemistry 2019-02-14T00:00:00Z They also record a rapid increase in light carbon, the isotope favored by life, driven by burning fossil fuels that were once organic matter. Bogs, lakebeds, and sea floors compete to become Anthropocene’s ‘golden spike’ 2022-05-05T04:00:00Z The discovery of radioactivity in the late 1800s enabled absolute dating, the assignment of numerical ages to events in the Earth’s history, using decay of unstable radioactive isotopes. An Introduction to Geology 2017-01-01T00:00:00Z The most stable isotopes of americium and curium decay faster than uranium’s most stable isotopes. Readers Respond to the December 2021 Issue 2022-04-27T04:00:00Z But two isotopes of the same element differ in the number of neutrons in their nuclei. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z What is the percent composition of Cu in terms of these two isotopes? Chemistry 2019-02-14T00:00:00Z The isotope U-235 of uranium must be enriched from less than 1 percent to about 5 percent to be used in most nuclear reactors. Opinion | We have to stop being afraid of nuclear energy 2022-04-19T04:00:00Z Accurately interpreting radioisotopic dating data depends on the type of rock tested and accurate assumptions about isotope baseline values. An Introduction to Geology 2017-01-01T00:00:00Z Holtec would have to handle it the same way, by filtering it, putting it into a tank, analyzing the radio isotopes and calculating the environmental impacts if it was released in batches, he added. EXPLAINER: Why would nuclear plant dump wastewater into bay? 2022-04-09T04:00:00Z Different isotopes of an element all have the same number of electrons, and so in theory will bond to other atoms in the same way. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z As you will learn, isotopes are important in nature and especially in human understanding of science and medicine. Chemistry 2019-02-14T00:00:00Z In a study last year, Lan looked at the chemical isotopes to isolate where steady increases in methane emissions since 2006 may be coming from. NOAA: Potent heat-trapping methane increases at record pace 2022-04-07T04:00:00Z An isotope is an atom of an element with a different number of neutrons. An Introduction to Geology 2017-01-01T00:00:00Z For Rongelap, further research is needed to understand the large amount of background gamma radiation on one of the northern islands, called Naen, as well as the presence of plutonium isotopes in the soil. The U.S. Must Take Responsibility for Nuclear Fallout in the Marshall Islands 2022-04-04T04:00:00Z Facts about these reactions may be deduced from changes in the isotope ratio. Marilyn Fogel, ‘isotope queen’ of science, dies at 69 2022-05-16T04:00:00Z Let's consider just one natural, stable isotope: Oxygen-18, which is noted in the table above and is referred to as one of the environmental isotopes. Chemistry 2019-02-14T00:00:00Z In a feat of scientific sleuthing, Jones and her colleagues analyzed two oxygen isotopes contained in a peat bog core sample pulled that year from a remote island. Into the ice: A crab boat’s quest for snow crab in a Bering Sea upended by climate change 2022-04-03T04:00:00Z Many elements have both stable and unstable isotopes. An Introduction to Geology 2017-01-01T00:00:00Z Their recently published data are similarly lacking in an examination of this dangerous nuclear isotope. The U.S. Must Take Responsibility for Nuclear Fallout in the Marshall Islands 2022-04-04T04:00:00Z |
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