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neptunium |
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neptunium [nɛpˈtjuːnɪəm] n (Chemistry / Elements & Compounds) a silvery metallic transuranic element synthesized in the production of plutonium and occurring in trace amounts in uranium ores. Symbol: Np; atomic no.: 93; half-life of most stable isotope, 237Np: 2.14 ✕ 106 years; valency: 3, 4, 5, or 6; relative density: 20.25; melting pt.: 639±1°C; boiling pt.: 3902°C (est.) [from Neptune2, the planet beyond Uranus, because neptunium is the element beyond uranium in the periodic table]
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Joni Arends, of Concerned Citizens for Nuclear Safety, said she was concerned about increasing levels of cesium and neptunium in wells making it to Santa Fe's drinking water. Topics include the mechanisms of long-term uranium transport under oxidizing conditions, the structural chemistry of thorium iodates, the structural investigation of neptunium (IV) in toxicological processes, murataite ceramics doped with lanthanides and uranium, and the effects of hydrogen peroxide on the stability of becquerelite. The Integral Fast Reactor's fuel cycle is the first one capable of taking actinides such as neptunium, americium, and plutonium and automatically putting them back--integrating them quickly and automatically--into the nuclear fuel stream. |
neptunium |
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