uranium 238
noun Date: 1942 an isotope of uranium of mass number 238 that is the most stable uranium isotope, that constitutes over 99 percent of natural uranium, that is not fissile but can be used to produce a fissile isotope of plutonium, and that has a half-life of 4.5 billion years

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Uranium-238 — Уран 238 природный изотоп урана с атомной массой 238. Содержание урана 238 в природном уране 99,28%, период полураспада 4,5·109 лет. Уран 238 подвергается ядерному делению под действием быстрых нейтронов и может использоваться в качестве… …   Термины атомной энергетики

  • Uranium-238 — Infobox isotope background =#fc6 text color = image caption = 10 gram sample alternate names = mass number =238 symbol =U num neutrons =146 num protons =92 abundance = 99.284% halflife = 4.46 billion years error halflife = decay product = Thorium …   Wikipedia

  • Uranium 238 — L uranium 238, noté 238U, est l isotope de l uranium dont le nombre de masse est égal à 238 : son noyau atomique compte 92 protons et 146 neutrons avec un spin 0+ pour une masse atomique de 238,0507826 g/mol. Il est caractérisé par un excès… …   Wikipédia en Français

  • uranium 238 — noun the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239 • Hypernyms: ↑uranium, ↑U, ↑atomic number 92 * * * noun : an isotope of uranium of mass number 238 that is the… …   Useful english dictionary

  • uranium 238 — Chem. the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239. Also called U 238, U 238. [1940 45] * * * …   Universalium

  • uranium 238 — n. chem. the radioactive uranium isotope having a mass number of 238, used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239 • Etymology: 1940–45 …   From formal English to slang

  • uranium-234-uranium–238 dating — Method of age determination that makes use of the radioactive decay of uranium 238 to uranium 234; the method can be used for dating sediments from either a marine or a playa lake environment. Because this method is useful for the period с… …   Universalium

  • uranium-234–uranium-238 dating —       method of age determination that makes use of the radioactive decay of uranium 238 to uranium 234; the method can be used for dating of sediments from either a marine or a playa lake environment. Because this method is useful for the period …   Universalium

  • Uranium — (pronEng|jʊˈreɪniəm) is a silvery gray metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. It has 92 protons and 92 electrons, 6 of them valence electrons. It can have between 141 and …   Wikipedia

  • Uranium — Protactinium ← Uranium → Neptunium Nd …   Wikipédia en Français

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