| 单词 | neptunium |
| 例句 | The neptunium series is a fourth series, which is no longer significant on the earth because of the short half-lives of the species involved. Chemistry 2019-02-14T00:00:00Z The plutonium began as a different element entirely, neptunium, which scientists irradiated with neutrons in a nuclear reactor for nearly two months to convert it to the plutonium form needed for the MMRTG. Why NASA’s Perseverance Mars Rover Uses Nuclear Energy 2020-07-29T04:00:00Z The DOE reported in 2017 that trace amounts of radioactive neptunium were detected on school grounds. School where radioactive elements found gets more testing 2019-05-27T04:00:00Z According to their letter, both enriched uranium and neptunium are "contaminants of concern" at the nearby Portsmouth Gaseous Diffusion Plant. Radioactive particles shut US school 2019-05-16T04:00:00Z The DOE reported in 2017 that trace amounts of radioactive neptunium were detected in an air monitoring station on school grounds. Discovery of radioactive material forces closure of Ohio school 2019-05-14T04:00:00Z 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 There, bathed in the electric-blue light of the nuclear High Flux Isotope Reactor, aluminum tubes packed with small, silvery cylinders of the radioactive element neptunium-237 are being bombarded with neutrons. NASA Struggles over Deep-Space Plutonium Power 2015-09-10T04:00:00Z “The people here hadn’t worked with neptunium before,” he says. Nuclear power: Desperately seeking plutonium 2014-11-24T05:00:00Z Because of neutron capture, shown in the figure above, other elements produced during the nuclear reactions include the heavy actinide elements, the last row in the periodic table – plutonium, americium, neptunium, and so on. A Nuclear Primer -- It's All About Uranium 2014-09-20T04:00:00Z The next planet out is Neptune, hence element 93 became neptunium - and logically element 94 became plutonium, after what was then believed to be the final planet in the solar system. The scary element that saved the crew of Apollo 13 2014-09-19T04:00:00Z At the agency's Oak Ridge National Laboratory in Tennessee, engineers successfully produced small amounts of plutonium-238 by irradiating targets of neptunium-237 with neutrons, Green said. US Makes First Plutonium in 25 Years, for Spacecraft 2013-03-19T20:15:00.393Z In partnership with NASA, the Department of Energy irradiated the radioactive metal neptunium-237 with neutrons at the Oak Ridge National Laboratory in Tennessee for about a month and successfully produced a small amount plutonium. U.S. restarts plutonium production for space probes 2013-03-19T01:31:35Z Once the neptunium pellets are made there, some will be sent to the Idaho lab, whose Advanced Test Reactor will help out by doing some of the irradiation. Nuclear power: Desperately seeking plutonium 2014-11-24T05:00:00Z The California scientists called the newly discovered element neptunium, because it lies beyond the element uranium just as the planet Neptune lies beyond Uranus. A Brief History of Element Discovery, Synthesis, and Analysis The neptunium is then sent to Oak Ridge, the once-secret city where uranium was enriched for the first nuclear bombs during the Second World War. Nuclear power: Desperately seeking plutonium 2014-11-24T05:00:00Z “We’re trying to squeeze as much neptunium into a finite volume as we can,” Bryan explains. Nuclear power: Desperately seeking plutonium 2014-11-24T05:00:00Z |
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