| 单词 | radioactive decay |
| 例句 | The weak force engages in more miscellaneous tasks, mostly to do with controlling the rates of certain sorts of radioactive decay. A Short History of Nearly Everything 2003-05-06T00:00:00Z Instead, Voyager relies on a small nuclear power plant, drawing hundreds of watts from the radioactive decay of a pellet of plutonium. Cosmos 1980-01-01T00:00:00Z 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 Rutherford's technique was fiendishly clever; his atom-splitting bullets were naturally generated by radioactive decay. The man who invented 'Big Science,' Ernest Lawrence 2015-07-16T04:00:00Z My income, like the carbon-14 my dad was measuring, was in a state of radioactive decay. The Season of the Skulls 2016-09-20T04:00:00Z 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 It forms through the radioactive decay of uranium and thorium deep in the crust and eventually seeps out and escapes into space. Impending sale of scientifically critical helium sparks worries 2023-11-05T04:00:00Z The atom-by-atom analysis enabled researchers to count how many atoms in the zircon crystals have undergone radioactive decay. The Moon is 40 million years older than previously thought 2023-10-23T04:00:00Z Instead the universe today is almost entirely matter, with antimatter occurring only rarely as a product of radioactive decay or in cosmic-ray collisions. What Happens if You Drop Antimatter? New Gravitational Test Sees First Fall 2023-09-27T04:00:00Z Its 8 protons and 16 neutrons are strongly bound to one another, giving it a relatively long lifetime — it takes about 61 milliseconds for half of the 24O to disappear through radioactive decay. Rare Superheavy Oxygen Isotope Is Detected at Last 2023-08-31T04:00:00Z The remaining two are more obscure: the strong force binds protons and neutrons together within atomic nuclei, whereas the weak force helps atoms and subatomic particles to fall apart via a form of radioactive decay. Will Scientists Ever Find a Theory of Everything? 2023-08-19T04:00:00Z That's how these metals produce energy without an external source: Uranium atoms, one at a time, morph into atoms of a different metal, thorium, through a process called radioactive decay. Will "godlike AI" kill us all — or unlock the secrets of the universe? Probably not 2023-08-12T04:00:00Z These RTGs are a kind of nuclear battery powered using heat from the natural radioactive decay of plutonium-238, making them long-lasting and fully functional even in the cold, dark depths of space. These are the oldest space probes that are still operational 2023-05-07T04:00:00Z 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 And because r-process nuclei would be unstable and undergo radioactive decay, they should be able to heat up the material surrounding them and power an electromagnetic flare that would carry signatures of the elements produced. How Star Collisions Forge the Universe’s Heaviest Elements 2023-01-09T05:00:00Z 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 That ends the process of radioactive decay, which has produced energy from beginning to end. Will "godlike AI" kill us all — or unlock the secrets of the universe? Probably not 2023-08-12T04:00:00Z For example, electron neutrinos emerge from the radioactive decay of some atomic nuclei. Showdown: Two huge neutrino detectors will vie to probe matter’s origins 2022-09-28T04:00:00Z What is the source of the energy emitted in radioactive decay? College Physics for AP Courses 2015-08-12T00:00:00Z We will discuss the nature and products of this radioactive decay in subsequent sections of this chapter. Chemistry 2019-02-14T00:00:00Z The weak force is involved in radioactive decay and in reactions that result in the production of neutrinos. Astronomy 2016-10-13T00:00:00Z What physicists Soddy and Rutherford realized was that nature itself is an alchemist, "transmuting" materials into other types of materials through the spontaneous process of radioactive decay. Will "godlike AI" kill us all — or unlock the secrets of the universe? Probably not 2023-08-12T04:00:00Z From the growth of populations and the spread of viruses to radioactive decay and compounding interest, the models are very different from what we have studied so far. Intermediate Algebra 2020-05-06T00:00:00Z Even when shut down after a period of normal use, a large commercial nuclear reactor transfers thermal energy at the rate of 150 MW by the radioactive decay of fission products. College Physics for AP Courses 2015-08-12T00:00:00Z It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. Chemistry 2019-02-14T00:00:00Z They dated the rocks surrounding the fossil to between 556 million and 562 million years ago using the radioactive decay of uranium into lead. David Attenborough gets a namesake: the oldest known relative of living animals 2022-07-25T04:00:00Z What Soddy and Rutherford realized was that nature itself is an alchemist, "transmuting" materials into other types of materials through the spontaneous process of radioactive decay. Will "godlike AI" kill us all — or unlock the secrets of the universe? Probably not 2023-08-12T04:00:00Z Exponential and logarithmic functions are used to model population growth, cell growth, and financial growth, as well as depreciation, radioactive decay, and resource consumption, to name only a few applications. Calculus, Volume 1 2016-03-30T00:00:00Z Explain in terms of the statistical nature of radioactive decay. College Physics for AP Courses 2015-08-12T00:00:00Z We use several units to measure radiation: becquerels or curies for rates of radioactive decay; gray or rads for energy absorbed; and rems or sieverts for biological effects of radiation. Chemistry 2019-02-14T00:00:00Z We can use the formula for radioactive decay: Algebra and Trigonometry 2015-02-13T00:00:00Z Exactly how much energy does radioactive decay produce? Will "godlike AI" kill us all — or unlock the secrets of the universe? Probably not 2023-08-12T04:00:00Z From population growth and continuously compounded interest to radioactive decay and Newton’s law of cooling, exponential functions are ubiquitous in nature. Calculus, Volume 1 2016-03-30T00:00:00Z Spontaneous radioactive decay occurs only when the decay products have less mass than the parent, and it tends to produce a daughter that is more stable than the parent. College Physics for AP Courses 2015-08-12T00:00:00Z For example, a “new element” produced by the radioactive decay of thorium was initially given the name mesothorium. Chemistry 2019-02-14T00:00:00Z 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 Nuclear power is energy released from the radioactive decay of elements, such as uranium, which releases large amounts of energy. Environmental Biology 2018-09-06T00:00:00Z Several mechanisms made the newly forming Earth incredibly hot: gravitational compression, radioactive decay, and asteroid impacts. An Introduction to Geology 2017-01-01T00:00:00Z The researchers, including experts from Johannesburg and France, examined radioactive decay in rocks buried at the same time as the fossils, whereas earlier estimates were based on calcite flowstone deposits. Fossils in South African cave reignite debate on origins of humankind 2022-06-29T04:00:00Z The spontaneous change of an unstable nuclide into another is radioactive decay. Chemistry 2019-02-14T00:00:00Z All are powered by a device that converts heat from the radioactive decay of plutonium into electricity. Record-Breaking Voyager Spacecraft Begin to Power Down 2022-06-16T04:00:00Z There is yet another particle in this zoo behaving strangely: the W boson, which conveys the so-called weak force responsible for radioactive decay. As the Large Hadron Collider Revs Up, Physicists’ Hopes Soar 2022-06-13T04:00:00Z 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 That was a scientific jackpot because scientists can date igneous rocks on the basis of the radioactive decay of their chemical elements. NASA’s Perseverance Rover Begins Key Search for Life on Mars 2022-06-07T04:00:00Z After the pumps stopped, the reactors overheated due to the high radioactive decay heat produced in the first few days after the nuclear reactor shut down. Chemistry 2019-02-14T00:00:00Z Emerging in the hot soup of particles after the big bang, WIMPs would interact with ordinary matter only through gravity and the weak nuclear force, which produces a kind of radioactive decay. To crack the mystery of dark matter, physicists turn to supersensitive quantum sensors 2022-04-27T04:00:00Z Crucially, the W boson is responsible for certain forms of radioactive decay, allowing neutrons to convert into protons. Elementary Particle’s Unexpected Heft Stuns Physicists 2022-04-07T04:00:00Z 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 Internal radioactive decay gives off heat and remains in the fuel rods for tens of thousands of years, so they can get hotter unless something is done to cool them, Regan said. EXPLAINER: What’s behind latest scare at Chernobyl plant? 2022-03-09T05:00:00Z If Sr was originally in the rock, the amount produced by radioactive decay would equal the present amount minus the initial amount. Chemistry 2019-02-14T00:00:00Z Deep below the dismantled site, 6500 tons of spent fuel rods will lie in their tombs, quiet but still warm from radioactive decay. Finland built this tomb to store nuclear waste. Can it survive for 100,000 years? 2022-02-23T05:00:00Z It attributed the decreases to radioactive decay, changes in waste-disposal methods, cleanup efforts and dilution from water coming into the aquifer. Cleanup of buried nuke waste at Idaho Superfund site is nearing the finish 2022-01-03T05:00:00Z 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 An analysis of the radioactive decay of isotopes in 47 hardened lava samples put the age of the rocks at 2.03 billion years old, 1 billion years younger than samples from the U.S. China’s Moon rocks reveal puzzlingly persistent volcanic eruptions 2021-10-19T04:00:00Z We classify different types of radioactive decay by the radiation produced. Chemistry 2019-02-14T00:00:00Z But he became more interested in teaching than in research, and in finding ways to reach students who might not otherwise care about covalent bonds or radioactive decay. Robert Wolke, chemist and Post columnist who demystified the kitchen, dies at 93 2021-09-02T04:00:00Z For example, helium 3 comes from a planet’s deep interior, but helium 4, a heavier isotope, is born from radioactive decay in the crust above. NASA Just Broke the ‘Venus Curse’: Here’s What It Took 2021-08-17T04:00:00Z 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 The weak force is one that is unseen in daily life and exists at the subatomic level, accounting for the radioactive decay of certain particles into certain others. Steven Weinberg, Nobel-winning physicist who united principal forces of nature, dies at 88 2021-07-26T04:00:00Z Because is a stable isotope and does not undergo radioactive decay, its concentration in the plant does not change. Chemistry 2019-02-14T00:00:00Z One of them, the strong force, binds atomic nuclei together; the last, the weak force, is implicated in certain types of radioactive decay. Dark matter's weirdness could be explained by a new, as-yet-unseen fundamental force 2021-06-04T04:00:00Z For example, helium-3 comes from a planet’s deep interior, but helium-4, a heavier type of helium, is born from radioactive decay in the crust above. Is NASA about to Lift the ‘Venus Curse?’ 2021-06-02T04:00:00Z This heat is caused by residual heat left from the formation of Earth and ongoing radioactive decay. An Introduction to Geology 2017-01-01T00:00:00Z “Because of radioactive decay, what we're measuring today is only a whiff of what was there before.” Nuclear fallout is showing up in U.S. honey, decades after bomb tests 2021-04-20T04:00:00Z When the rock formed, it contained all of the U-238 currently in it, plus some U-238 that has since undergone radioactive decay. Chemistry 2019-02-14T00:00:00Z The faster a planet loses its internal heat—which comes from its initial fiery formation, as well as thermal energy from radioactive decay—the sooner the planet’s geologic activity will cease. NASA Ends Efforts to Deploy Mars InSight's 'Mole' 2021-01-20T05:00:00Z They are typically predicted to be 1–1,000 times heavier than protons and to interact with matter only feebly — through the weak nuclear force, which is responsible for radioactive decay, or something even weaker. Last chance for WIMPs: physicists launch all-out hunt for dark-matter candidate 2020-10-01T04:00:00Z The radioactive decay of any individual atom is a completely unpredictable and random event. An Introduction to Geology 2017-01-01T00:00:00Z The radioactive decay of potassium-40 is one kind of geological clock. The Meaning of Time in the Place where Humanity's Earliest Ancestors Arose 2020-06-27T04:00:00Z Because when one mole of U-238 decays, it produces one mole of Pb-206, the amount of U-238 that has undergone radioactive decay since the rock was formed is: Chemistry 2019-02-14T00:00:00Z Moreover, the CN neutrinos are easy to confuse with those produced by the radioactive decay of bismuth-210, an isotope that leaks from the balloon’s nylon into the hydrocarbon mixture. Neutrinos reveal final secret of Sun’s nuclear fusion 2020-06-23T04:00:00Z The radioactive decay of nickel to cobalt and then iron powers a brilliant afterglow that peaks in a couple of weeks and fades over years. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z To date the images, the researchers measured the radioactive decay of uranium in mineral deposits that had formed atop them. Is This Indonesian Cave Painting the Earliest Portrayal of a Mythical Story? 2019-12-12T05:00:00Z The concentration of argon-40 in Earth’s atmosphere is slowly increasing with time as it is produced from the radioactive decay of potassium-40. Ancient air challenges prominent explanation for a shift in glacial cycles 2019-10-29T04:00:00Z When neutrons are required for transmutation reactions, they are usually obtained from radioactive decay reactions or from various nuclear reactions occurring in nuclear reactors. Chemistry 2019-02-14T00:00:00Z Another potential concern is the unknown relationship between high helium ratios and isotopes produced by radioactive decay that are measured in diamonds. Enigmatic origin of diamond-bearing rocks revealed 2019-09-24T04:00:00Z The team dated the skull using the radioactive decay of isotopes of argon in the surrounding sediments. Stunning ancient skull shakes up human family tree 2019-08-28T04:00:00Z But researchers recently used laboratory techniques that looked at the radioactive decay of trace amounts of uranium in the specimens and concluded that the individuals came from different eras. Enigmatic skull suggests our human species reached Europe 210,000 years ago 2019-07-10T04:00:00Z Scientists on the team then dated the fossils with a method that relies on the radioactive decay of natural uranium in the buried remains. Piece of skull found in Greece ‘is oldest human fossil outside Africa’ 2019-07-10T04:00:00Z But no mention is made of dendrochronology, a complementary method that corrects for the tendency of carbon radioactive decay to drift, and thus cause inaccuracies to creep in as specimens age. An ode to carbon 2019-06-11T04:00:00Z Quantum theory predicts the rate of radioactive decay. A little-known quantum mechanics theorem explains the nature of all reality 2019-05-19T04:00:00Z In 1901, Brooks and Rutherford showed that the emanation diffused like a heavy gas, providing the first evidence that a new element could be produced during radioactive decay. Celebrate the women behind the periodic table 2019-01-27T05:00:00Z Another test is to measure the rate of radioactive decay of certain elements in the rocks, also known as carbon dating. Scientists study lava for clues to how volcano will behave 2018-05-16T04:00:00Z A preliminary theory about the cause of the rupture is that radioactive decay made the barrel heat up and ignite particles of uranium. Radioactive sludge barrel ruptures at Idaho nuclear site 2018-04-12T04:00:00Z In the case of radioactive material, how long the substance is dangerous depends on how quickly its atoms lose energy, a process known as radioactive decay and measured by what’s called a half-life. How the nerve agent in the spy attack and other toxins cause widespread contamination 2018-03-23T04:00:00Z As in the 2012 study, the team determined the age of the paintings using a radiometric technique called uranium–thorium dating, which is based on the radioactive decay of uranium into thorium over time. Ancient Cave Paintings Clinch the Case for Neandertal Symbolism 2018-02-23T05:00:00Z Working at the Radium Institute in Vienna, she showed that even a common element such as lead can have different atomic weights, depending on whether it stems from the radioactive decay of uranium or thorium3. Celebrate the women behind the periodic table 2019-01-27T05:00:00Z It relies on measuring the radioactive decay of uranium that gets incorporated into mineral crusts forming over the paintings. Neanderthals were capable of making art 2018-02-22T05:00:00Z Another technique uses the rate of uranium’s radioactive decay as a clock. Ancient cave paintings turn out to be by Neanderthals, not modern humans 2018-02-22T05:00:00Z One class of hypothetical objects that might be dark matter do interact via the weak force, a phenomenon that also controls some sorts of radioactive decay. Fundamental physics is frustrating physicists 2018-01-11T05:00:00Z The neutrino was first postulated in 1930, by the Nobel physics laureate Wolfgang Pauli, to explain the behaviour of other subatomic particles during radioactive decay. In search of the neutrino, ghost particle of the universe 2017-11-04T04:00:00Z Hahn and Meitner discovered protactinium while they were looking for the ‘mother substance’ of actinium in the radioactive decay series. Celebrate the women behind the periodic table 2019-01-27T05:00:00Z Those nuclei beef up by gobbling neutrons in rapid succession and then quickly change their chemical identities through radioactive decay. Merging neutron stars generate gravitational waves and a celestial light show 2017-10-16T04:00:00Z In 1914, U.K. physicist James Chadwick was studying beta decay, a form of radioactive decay in which a nucleus emits an electron, transforming a neutron into a proton. Weighing the universe's most elusive particle 2017-06-29T04:00:00Z The methods used to determine age—based on radioactive decay or looking at microscopic fossils with known ages—are continuously improved by scientists. Could Asteroids Bombard the Earth to Cause a Mass Extinction in 10 Million Years? 2017-06-25T04:00:00Z Water also affects radiation levels in the chamber, which can throw off calculations of age based on rates of radioactive decay. Humanity’s strange new cousin is shockingly young — and shaking up our family tree 2017-05-09T04:00:00Z Securing values for atomic weights was also crucial for working out radioactive decay series, and for telling apart new elements and unknown versions of existing ones — isotopes. Celebrate the women behind the periodic table 2019-01-27T05:00:00Z They attempted to date fossils using the uranium-thorium method, which measures radioactive decay of uranium. But the technique was not very reliable at the time, so the Cerutti mastodon remained an enigma. Archaeology shocker: Study claims humans reached the Americas 130,000 years ago 2017-04-26T04:00:00Z The dating method used by the researchers to assign an age to the material works by measuring the radioactive decay of uranium that becomes incorporated into the bones over time. First Americans claim sparks controversy - BBC News 2017-04-26T04:00:00Z Carbon dating and another procedure did not work in this case, so the scientists turned to a method that infers age from the radioactive decay of natural uranium which infiltrates the buried remains. Could history of humans in North America be rewritten by broken bones? 2017-04-26T04:00:00Z Instead, the team relied on a dating technique based on the radioactive decay of uranium in minerals within the bone. Were humans in the Americas 100,000 years earlier than scientists thought? 2017-04-26T04:00:00Z The team also found that natural radioactive decay and weathering from rain deserve far more credit for reducing radiation levels than do expensive decontamination efforts, like topsoil removal. It’s safe to return to Fukushima, study suggests 2017-03-10T05:00:00Z They discovered that the radioactive decay of elementary particles called muons doesn't obey otherwise-universal rules. Physics: Six decades of science advising : Nature : Nature Research 2017-02-14T05:00:00Z That means that future scientists won’t be able to date the Martian rocks using a radioactive decay system that relies on tungsten and hafnium; they will have to choose from several other alternatives. The $2.4-billion plan to steal a rock from Mars 2017-01-17T05:00:00Z The researchers determined the age of the organic material from the site through radiocarbon dating, a technique that measures the radioactive decay of carbon by comparing isotope ratios. Man looking for a place to pee stumbles upon one of Australia’s oldest prehistoric sites 2016-11-08T05:00:00Z When an organism dies, radioactive decay gradually diminishes the concentration of 14C in its remains. Shell shock 2016-07-14T04:00:00Z Our world’s supply is created through the radioactive decay from uranium. Giant helium field could inflate the world’s dwindling supply 2016-06-28T04:00:00Z In the 1950s, Garwin did an experiment showing an anomaly in radioactive decay that is now standard particle physics. Physics: Six decades of science advising : Nature : Nature Research 2017-02-14T05:00:00Z It is present in all stars and on Earth is formed by the slow and steady radioactive decay of terrestrial rock. Helium discovery a 'game-changer' - BBC News 2016-06-28T04:00:00Z The poison's release is set to be triggered by the radioactive decay of a subatomic particle. Schrödinger’s cat just got even weirder (and even more confusing) 2016-05-27T04:00:00Z Imagine the size of the proverbial mushroom cloud and the radioactive decay in the aftermath. The Mitt has just hit the fan: Why Romney’s stunning denunciation of Trump matters 2016-03-03T05:00:00Z From deep inside Pluto, a small amount of radioactive decay warms the dwarf planet, enough to lift the nitrogen up before it cools and falls for the cycle to begin again. New Horizon's latest photos of Pluto: 'This part acts like a lava lamp' 2016-01-08T05:00:00Z They are the first to be added to the table since 2011 and were all discovered by smashing other nuclei into each other and tracking their radioactive decay. 4 New Elements Have Been Added to the Periodic Table 2016-01-04T05:00:00Z All that activity suggests that some internal heat source — most likely the radioactive decay of elements left over from Pluto’s birth, 4.5 billion years ago — keeps things warm enough to flow. Icy volcanoes may dot Pluto's surface 2015-11-08T05:00:00Z The element generates thermal energy for close to a century through radioactive decay; in theory, it could keep recipients alive well into old age. Inside the 50-year-quest to build a mechanical heart 2015-11-04T05:00:00Z Deep in the heart of Pluto, radioactive decay produces a modicum of heat that warms the body ever so slightly. Pluto as we know it now: Nasa report unwraps enigma of dwarf planet 2015-10-15T04:00:00Z The team used the radioactive decay of uranium to thorium to date this stalagmite to 80,000 years ago—a minimum age for the teeth. Trove of teeth from cave represents oldest modern humans in China 2015-10-14T04:00:00Z That happened for physicists in 1930, who were trying to figure out why there was some troubling missing energy in radioactive decay. Why we should care about the Nobel Prize for the neutrino 2015-10-06T04:00:00Z A Standard Model principle known as lepton universality says that all leptons should be treated equally by the weak interaction, the fundamental force responsible for radioactive decay. Two Accelerators Find Particles that May Break Known Laws of Physics 2015-09-09T04:00:00Z It detected lead and uranium, and radioactive decay enabled age determination. Earth magnetic shield is older than previously thought - BBC News 2015-07-31T04:00:00Z If life ever existed on Mars, it might still exist in the subsurface, powered by the slight geochemical energy of radioactive decay. Life Ain't Easy: What Would Make an Exoplanet "Earth-Like"? [Excerpt] 2015-04-30T04:00:00Z The radioactive decay created pressure, pushing the lighter materials around it away, creating a cavity surrounded by these structures. Fiery star deaths may look different than we thought 2015-01-29T05:00:00Z At its Jet Propulsion Laboratory in Pasadena, California, materials engineer Jean-Pierre Fleurial leads a group that is exploring ways to build thermocouples, the devices that generate electricity from plutonium’s radioactive decay. Nuclear power: Desperately seeking plutonium 2014-11-24T05:00:00Z These particles are actually the nuclei of helium atoms, and it is because of the radioactive decay of uranium and other unstable elements that helium exists on Planet Earth. The element that causes arguments 2014-10-18T04:00:00Z If Pluto has ice geysers or volcanoes, that is a clue that the interior is warm and watery—perhaps as the result of radioactive decay in a rocky core. Kuiper Belt Missions Could Reveal the Solar System’s Origins 2014-10-15T04:00:00Z The scientists used a method based on the radioactive decay of tiny quantities of uranium in small mineral growths dubbed "cave popcorn" that formed on some of the paintings. Ancient Indonesian cave paintings rewrite history of human art 2014-10-08T04:00:00Z Will the unmistakable thumbprint of radioactive decay hover over our cities like a death pall? Unintentionally hilarious “Morning Joe” graphic identifies Bill Kristol as harbinger of doom 2014-08-08T04:00:00Z Ordinary double β decay is a form of radioactive decay where elements transmute by jumping two steps ahead in the periodic table — for example, from xenon to barium. Radioactive leak shuts down neutrino study 2014-06-03T04:00:00Z This force is responsible for nuclear fusion as well as radioactive decay — such as neutron beta decay. Neutron death mystery has physicists stymied 2014-05-12T04:00:00Z This force is responsible for nuclear fusion as well as radioactive decay—such as neutron beta decay. Neutron Death Mystery Has Physicists Stymied 2014-05-13T11:00:00Z Much of the helium emitted at Yellowstone is helium-4, an isotope produced by radioactive decay of elements such as uranium and thorium in the crust. Helium high 2014-02-19T18:50:03.680Z Considerable radioactive decay and tidal flexing seem necessary, but are hard to explain. Water Erupts Across the Solar System 2014-01-27T14:14:17Z The cancelled ASRGs would have generated electrical power from the expansion of gas warmed by the radioactive decay of plutonium-238. NASA Pulls the Plug on Plutonium Power Source 2013-11-19T04:15:00.540Z After nearly a decade of work, the result of their painstaking search for one of the rarest radioactive decay processes in the universe — if it exists — was about to be revealed. Search Escalates for Key to Why Matter Exists 2013-10-23T11:45:00.563Z The first argument was completely undermined after taking into account the amount of heat generated by radioactive decay. How Science Figured Out the Age of the Earth 2013-10-20T14:15:00.407Z The spacecraft draws power from the radioactive decay of Plutonium 238, and Stone thinks the dwindling power supply will force engineers to start turning off instruments in 2020. After 36 years, Voyager 1 goes interstellar 2013-09-13T01:09:00Z The infrared afterglow of this burst of gamma-ray light appears to show the characteristics expected during radioactive decay of atomic nuclei generated in a neutron star collision. Neutron starbursts can forge gold 2013-07-18T19:53:11Z This included a description of six X-ray lines that were thought to be due to natural radioactive decay producing the new element. A Tale of 7 Elements: Element 85 Astatine [Excerpt] 2013-07-05T14:15:00.623Z Assuming that uranium and thorium are spread uniformly in the mantle, the KamLAND findings suggest that about 11 of the 47 TW come from the radioactive decay of those elements. Detectors zero in on Earth’s heat 2013-04-03T17:20:20.957Z Crotts says it’s possible that the gas is just being produced by radioactive decay and simply using the moon’s ancient lunar plumbing to get out. Active Moon? Recent Lunar Surface Phenomena May Signal Some Form Of Volcanism 2013-04-01T02:31:36Z “While the tests did not include any radioisotope releases, the pods were able to collect and identify naturally occurring radioisotopes of lead and bismuth produced from the radioactive decay of atmospheric radon.” Drones To Be Deployed As Nuclear Fallout Detectors 2013-03-13T12:56:58Z Becquerel per hour measures the amount of radiation emitted or the rate of radioactive decay. Insight: Japan's "Long War" to shut down Fukushima 2013-03-05T22:06:11Z The first is the power supply, which uses radioactive decay with an 88-year half-life. Voyager spacecraft are still making discoveries 35 years after their launch 2012-12-17T19:49:34Z Electroweak refers to two forces of nature: the electromagnetic force, which unites electricity and magnetism, and the weak force, which governs radioactive decay. Why do physicists care so much about finding the Higgs boson? 2012-11-21T19:45:06.383Z However, if the Earth is only 9,000 years old, then radioactive decay rates are unstable and subject to rapid acceleration under completely unknown circumstances. Why Marco Rubio Needs To Know That The Earth Is Billions Of Years Old 2012-11-19T23:33:22Z But planetary scientists reckon both may have subsurface oceans, kept liquid by a combination of radioactive decay and tidal heating from Saturn and Jupiter, their respective parent planets. Astrobiology: A harvest of new moons 2012-11-08T16:00:15Z She notes that the theory does not totally explain all of the excess heavy xenon in the atmosphere, nor for additional xenon made from the radioactive decay of uranium and plutonium in rocks. The Mysterious Case of the Missing Noble Gas 2012-10-11T17:15:01.623Z In the case of Curiosity, the steady radioactive decay of plutonium 238 warms such thermoelectric material and turns roughly 4 percent of that heat into a steady flow of electrons. Improved Thermoelectrics Could Migrate from Space to Earth 2012-09-20T18:45:20.850Z The rover relies on the heat from the natural radioactive decay of plutonium-238 to generate its electricity. Rover panorama: Begin exploring Mars 2012-08-17T15:55:52Z On checking equipment in his laboratory, he was surprised to discover that the rate of radioactive decay changed before the solar flare. System could warn of solar storms 2012-08-15T22:59:14Z This force involves the movement and state of atomic particles, as well as radioactive decay. Martin Fleischmann, Cold Fusion Seeker, Dies at 85 2012-08-11T22:03:24Z Curiosity's unprecedented science payload draws its power from a radioisotope thermoelectric generator, a 4.8-kilogram plutonium fuel source whose radioactive decay provides heat, which devices called themocouples convert to about 110 watts of electricity. NASA's Curiosity Rover Lands Safely on Mars 2012-08-06T08:45:00.397Z Unlike the earlier rovers, Curiosity is powered by plutonium, generating electricity from the heat of radioactive decay. Curiosity, NASA Rover, Ready for Mars Landing 2012-07-30T19:09:45Z It is based on the radioactive decay of one isotope into daughter isotopes according to a precise clock, a half-life, governed by nuclear physics. Planetary science: The time machine 2012-07-25T17:20:40.527Z It is unclear how solar particles affect rates of radioactive decay, but Prof Jenkins asserts that "either neutrinos are affecting the decay rate or perhaps an unknown particle is". System could warn of solar storms 2012-08-15T22:59:14Z The other force became the weak nuclear force, which causes certain kinds of radioactive decay, and works through heavy particles called W and Z bosons. Higgs triumph opens up field of dreams 2012-07-11T17:20:25.187Z The uranium veins in South Texas are relatively new, he said, and the radioactive decay needed to create helium “is associated with very, very old rocks.” The Texas Tribune: Legislation Proposed to Extend Texas Helium Sales Deadline 2012-05-18T05:40:05Z Natural circulation in the reactor alone is enough to remove all the heat generated by the radioactive decay of the elements in the reactor fuel. Can Fast Reactors Speedily Solve Plutonium Problems? 2012-03-21T11:45:00.387Z Like other rock-dating systems, this one computes an age from the radioactive decay of certain isotopes in a sample. Planetary science: The time machine 2012-07-25T17:20:40.527Z Proponents say “it’s like magic — compound interest on the one hand and radioactive decay on the other,” he said. As Nuclear Reactors Age, Funds to Close Them Lag 2012-03-21T02:47:57Z Water flooded emergency generators, leaving the plant without power for cooling systems, while radioactive decay continued to heat the cores. Nuclear crisis: Fukushima's legacy of fear 2012-03-07T18:20:26.903Z The ratio of more short-lived isotopes -- barium-140 and its radioactive decay product lanthanum-140--pointed to a second test around May 11. Isotopes Hint at North Korean Nuclear Weapons Tests in 2010 2012-02-03T20:15:16.477Z In order to become more stable, the nucleus of an actinide element undergoes radioactive decay, releasing gamma rays, alpha particles, beta particles, or neutrons. The Disappearing Actinides, and Other Frustrations from the Bottom Row of the Periodic Table of the Elements 2012-01-27T18:45:02.817Z Curiosity is powered by heat from the radioactive decay of plutonium. NASA rover launched to seek out life clues on Mars 2011-11-27T11:22:26Z Instead of solar power, Curiosity is equipped with a plutonium battery that generates electricity from the heat of radioactive decay. New NASA rover to scout for life's habitats on Mars 2011-11-24T06:23:31Z They carry plutonium 238, a manufactured isotope with a half-life of just 88 years, which means that its radioactive decay is so fast that it glows red-hot. Green Blog: The Competition Between Solar and Nuclear Energy Moves to Mars 2011-11-23T17:29:48Z A becquerel represents one radioactive decay per second and involves the release of atomic energy, which can damage human cells and DNA. Fukushima Plant Released Record Amount of Radiation Into Ocean 2011-10-31T05:35:42Z The experiments also need additional shielding from radioactive decay from the walls of the underground laboratories and the experimental equipment itself. New Results Spotlight Conflicting Findings on Dark Matter 2011-09-13T17:45:09.517Z Because radioactive decay proceeds at a known pace, the findings reveal how much heat Earth is losing now and the rate at which it lost heat in the past, Stevenson says. Earth Still Retains Much of Its Original Heat 2011-07-17T18:00:00Z Helium-3, once considered a waste product, is produced by the radioactive decay of tritium, a form of hydrogen used in nuclear weapons to increase the yield. Agencies? Lack of Coordination Hindered Supply of Crucial Gas, Report Says 2011-05-28T16:45:52Z But Enceladus receives only a fraction of that from the combination of radioactive decay and tidal flexing from Saturn's powerful gravity, said Francis Nimmo, a planetary scientist at the University of California, Santa Cruz. Evidence Mounts for Liquid Water on Enceladus 2011-05-24T23:15:01.383Z Neutrinos, produced in the fusion of the Sun and other stars and in the radioactive decay of elements, flood the universe; trillions of them zip through every person every second. Maurice Goldhaber, Atomic Physicist, Is Dead at 100 2011-05-18T00:50:46Z In the meantime, it remains to be seen how these findings will affect the use of radioactive decay in technological applications. Radioactive Decay Rates May Not Be Constant After All 2011-05-03T13:06:45Z Despite the small number, the team estimates that about 4.3 million of the particles generated by the radioactive decay of uranium-238 and thorium-232 pass through each square centimeter of Earth's surface each second. Earth Still Retains Much of Its Original Heat 2011-07-17T18:00:00Z Even so, the detector gets some deceptive signals, for instance stray neutrons from the occasional radioactive decay of atoms within the experimental apparatus and electrons from radioactive krypton contaminating the liquid xenon itself. Underground Xenon100 experiment closes in on dark matter's hiding place 2011-04-14T23:15:00.250Z One becquerel represents the rate of radioactive decay—or radiation emitted by a substance—as one disintegration, or count, per second. Half-Life and Death: Radioactive Drinking Water Scare in Japan Subsides, but Questions Remain 2011-04-01T22:45:05.727Z And day by day, the radioactive decay in the reactor cores is ebbing. The Meltdown That Wasn't: Quick Decisions Prevented a Bigger Nuclear Catastrophe 2011-03-22T23:45:00.460Z Ultimately, Fukushima may share the fate of Chernobyl, entombed in concrete and sand while radioactive decay—and heat generation—continue. Fate of Nuclear Plant in Japan Hangs in the Balance as Melting Continues 2011-03-19T00:15:06.053Z Plutonium is a natural byproduct of radioactive decay and spent fuel rods are thus full of the stuff. MOX: The New Word from Fukushima that Has Nuclear Officials Worried 2011-03-18T00:03:16Z Positron emission tomography, or Pet, measures the brief flashes of high-energy light that result from the radioactive decay of a "tracer" molecule. Wearable scanner maps rat brains 2011-03-14T11:56:34Z That would be long enough to allow the compound's manufacturer, Eli Lilly, based in Indianapolis, Indiana, to send labelled florbetapir directly to users without losing too much of the reagent to radioactive decay. Alzheimer's-disease probe nears approval 2011-01-26T18:21:43.470Z The Earth's retrievable sources of helium were created over millennia by the radioactive decay of rock, and it is often extracted from natural gas. Nation's helium reserve running on empty? 2010-10-11T21:00:00Z Study coauthor Audrey Bouvier of Arizona State measured the ratios of variants of lead atoms produced by the radioactive decay of uranium present when the inclusions formed. Solar System Older Than Estimated 2010-08-24T14:48:00Z Geoneutrinos originate from the radioactive decay of uranium, thorium and potassium in the Earth's crust and mantle -- the thick layer extending to 1,800 miles below the surface. Discovery of Subatomic Particles Could Answer Deep Questions in Geology 2010-06-22T16:08:00Z The muon is unstable, eventually undergoing a radioactive decay into an electron. LRL Accelerators The 184-Inch Synchrocyclotron It measures the amount of ionization produced per unit volume by the particles from radioactive decay. Worldwide Effects of Nuclear War: Some Perspectives One well-known website offers random bits generated by radioactive decay. The Jargon File, Version 4.2.2, 20 Aug 2000 Beta--Another form of radioactive decay is the emission of a beta particle, or electron. Worldwide Effects of Nuclear War: Some Perspectives No one knows whether radioactive decay dominates the heating action or is just a player among many factors. Discovery of Subatomic Particles Could Answer Deep Questions in Geology 2010-06-22T16:08:00Z The three basic modes of radioactive decay are the emission of alpha, beta and gamma radiation: Alpha--Unstable nuclei frequently emit alpha particles, actually helium nuclei consisting of two protons and two neutrons. Worldwide Effects of Nuclear War: Some Perspectives The nuclei of these unstable "isotopes," as they are called, are "uncomfortable" with the particular mixture of nuclear particles comprising them, and they decrease this internal stress through the process of radioactive decay. Worldwide Effects of Nuclear War: Some Perspectives The concept of "half-life" is basic to an understanding of radioactive decay of unstable nuclei. Worldwide Effects of Nuclear War: Some Perspectives In the case of thorium-232, for example, radioactive decay proceeds so slowly that 14 billion years must elapse before one-half of an initial quantity decayed to a more stable configuration. Worldwide Effects of Nuclear War: Some Perspectives |
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