Elements, Radioactive. Radioactive Elements . Unstable elements with atomic numbers greater than 83 that exist in nature solely as radioisotopes. . 1.00
Radioactivity. Radioactive Disintegration . Decay, Nuclear . Disintegration, Radioactive . Disintegrations, Radioactive . Radioactive Disintegrations . Radioactivities . Nuclear Decay . The spontaneous transformation of a nuclide into one or more different nuclides, accompanied by either the emission of particles from the nucleus, nuclear capture or ejection of orbital electrons, or fission. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed) . 0.65
Radioactive Confinement. RADIACTIVE CONFINEMENT . Confinement of radioactive material so that their dispersal into the environment is prevented, or so that their release is given in a specific rate. . 0.62
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Elements. Substances that comprise all matter. Each element is made up of atoms that are identical in number of electrons and protons and in nuclear charge, but may differ in mass or number of neutrons. . 0.62
Radioactive Tracers. Tracers, Radioactive . Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., Geiger counter. Compounds containing tracers are often said to be tagged or labeled. (Hawley's Condensed Chemical Dictionary, 12th ed) . 0.59
Radioactive Fallout. Fallout, Radioactive . Fallouts, Radioactive . Radioactive Fallouts . Radioactive Rain . The material that descends to the earth or water well beyond the site of a surface or subsurface nuclear explosion. (McGraw-Hill Dictionary of Chemical and Technical Terms, 4th ed) . 0.59
