| 单词 | technetium |
| 例句 | Note that Table 32.1 lists many diagnostic uses for 99m Tc , where “m” stands for a metastable state of the technetium nucleus. 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 Like all elements first born in cyclotrons, technetium was radioactive. The Histories Hidden in the Periodic Table 2019-12-27T05:00:00Z That means it’s likely that the operator had been recently exposed to the technetium when a different patient was cremated. Radiation in a crematorium traced back to a human body 2019-02-26T05:00:00Z A News & Views In Retrospect describes how the 1937 discovery of technetium, the first element to be artificially produced, paved the way for research into the heaviest of elements. Beyond the periodic table 2019-01-29T05:00:00Z But arguably the greatest discovery remains technetium, and the metastable isotope of the element that Segrè discovered with Seaborg. The first synthetic element 2019-01-27T05:00:00Z Damaged tissues in the heart, liver, and lungs absorb certain compounds of technetium-99 preferentially. Chemistry 2019-02-14T00:00:00Z In 1937, element 43 became the first to be artificially produced, named technetium. Celebrate the women behind the periodic table 2019-01-27T05:00:00Z The fourth, now known as technetium, was first synthesized in 1937. Happy Sesquicentennial, Periodic Table! 2019-01-22T05:00:00Z They distribute the material to specialized pharmacies around the country where technicians process it into a diagnostic imaging agent called technetium-99. Inside the Global Relay Race to Deliver Moly-99 2018-01-12T05:00:00Z Element 43 was later found and named technetium in 1937 and the symbol “Np” was used to describe neptunium in 1940. Godzillium vs. Trumpium: Some Suggestions to Add to the Periodic Table 2016-01-14T05:00:00Z A number of artificial elements, including technetium, astatine, and the transuranium elements, have been produced in this way. Chemistry 2019-02-14T00:00:00Z Each successive milking produces less technetium, as the molybdenum itself decays away. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z This has a half-life of 66 hours and slowly decays into technetium. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z When the U235 content burns down to 0.3%, the fuel is spent, but it contains some very radioactive isotopes of americium, technetium, and iodine, as well as plutonium. The Thing About Thorium: Why The Better Nuclear Fuel May Not Get A Chance 2012-02-16T23:59:05Z After the first five hours of operation, Tepco found that the cartridge for removing oil and technetium was absorbing radioactive material far more than initially projected, indicating the need to frequently change the cartridges. Tepco to Restart Decontamination System 2011-06-20T10:52:59Z The isotope, technetium 99, is used to measure blood flows in the heart and to help diagnose bone and breast cancers. 2010-02-16T19:11:00Z That gap - element number 43 - was for technetium. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z The team awaits approval from Health Canada, which will confirm that its technetium is safe for use. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z One special isotope of technetium has a very useful application. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z And this is the magic of the technetium scan. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z First, she has to be injected with the technetium. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z It so happens, though, that some technetium does exist in the natural world. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z Advanced Cyclotron Systems — a firm in Richmond, Canada, that sells cyclotrons and is working to make cyclotron technetium — has had inquiries from the United Kingdom, Saudi Arabia, Thailand and more. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z Her doctor assays the dose - the technetium is continually decaying, so it is important to check that it is still sufficiently radioactive to produce an image, but not enough to be harmful. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z Each radioactive atom is attached to a "ligand" - a chemical that ensures the technetium reaches the right part of Sarah's body. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z Wait too long, and the technetium will decay away altogether - it has a half-life of six hours - or be flushed out of Sarah's body. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z You can replace the technetium with something that emits far more powerful radiation that will destroy surrounding tissues, in particular cancer cells. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z He still worries that in a few years he will have to go to patients with difficult news: that a widespread shortage of technetium means that they cannot have the diagnostic tests that they need. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z Bone is just one material that technetium can be used to peer at. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z The technetium is produced by the decay of another radioactive isotope - molybdenum-99. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z The molybdenum can be regularly "milked" by passing salty water over it, washing out the day's yield of technetium. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z And technetium is not a commodity that can be stockpiled - it just decays away. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z By flushing the technetium out with saline solution, hospital technicians can milk the moly cows for fresh supplies of technetium for up to two weeks. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z So Martin is engaged in one of several projects around the world that aims to provide an entirely new source of technetium. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z Atcher, however, is not convinced that the approach will be helpful in the United States, where, by chance, most hospitals have lower-power cyclotrons that could not produce as much technetium. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z The result, about the size of a microwave oven, requires a computer, pipes and valves to extract technetium — more complex than the simple saline wash that hospitals use today. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z Because it turns out that due to a quirk in the mathematics of atomic nuclei, every single isotope of technetium is unstable - all versions of technetium are radioactive and eventually decay into other elements. The element that can make bones glow - BBC News 2015-05-29T04:00:00Z Underlying all the jostling are questions to which no one has good answers: how expensive the technetium from these new technologies will be, and whether the schemes will create enough to replace the nuclear-reactor approach. Radioisotopes: The medical testing crisis 2013-12-11T18:50:32.531Z |
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