Natural Phenomenon or Process
radioactivity
ra·di·o·ac·tiv·i·ty [ rey-dee-oh-ak-tiv-i-tee ]
Definitions related to radioactivity:
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The quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83 and possible of induction in all other known elements.NCI ThesaurusU.S. National Cancer Institute, 2021
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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)NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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