For Radioactive Decay we have terms and definitions in 6 topics. The topics are Anthromorphemics, Anthropology, Atmospheric Chemistry, Environment, Oceanography and Physical Geography.

The regular process by which radioactive isotopes break down into their decay products with a half-life which is specific to the isotope in question (see also radiocarbon dating).
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The regular process by which radioactive isotopes break down into their decay products with a half-life which is specific to the isotope in question (see also radiocarbon dating).
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The spontaneous breakdown of certain kinds of atomic nuclei into one or more nuclei of different elements, involving the release of energy and subatomic particles. [Crutzen, Paul J. and Graedel, T.E. Atmospheric Change: An Earth System Perspective. p. 436.]
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Spontaneous change in an atom by emission of of charged particles and/or gamma rays; also known as radioactive disintegration and radioactivity.
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The breakdown of a radioactive material into a more stable element. Such a process depends on the original material - some breakdowns take fractions of a second, others millions of years.
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Natural decay of the nucleus of an atom where alpha or beta particle and/or gamma rays are released at a fixed rate.
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