Uranite-group
noun
1.
the mineralogical group including uranites and related minerals.
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- Uranium
noun, Chemistry. 1. a white, lustrous, radioactive, metallic element, occurring in pitchblende, and having compounds that are used in photography and in coloring glass. The 235 isotope is used in atomic and hydrogen bombs and as a fuel in nuclear reactors. Symbol: U; atomic weight: 238.03; atomic number: 92; specific gravity: 19.07. noun 1. a […]
- Uranium-235
noun, Chemistry. 1. the radioactive uranium isotope having a mass number of 235, comprising 0.715 percent of natural uranium. When bombarded with neutrons it undergoes fission with the release of energy.
- Uranium-238
noun, Chemistry. 1. 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.
- Uranium-239
noun, Chemistry. 1. the uranium isotope with a mass number 239. It is artificially produced by the neutron bombardment of uranium 238.
- Uranium-dating
noun 1. a method of dating archaeological or geological specimens by determining the decay activity of the uranium in a given sample.