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radioactivity definitions

WordNet (r) 3.0 (2005)

n
1: the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay [syn: radiation, radioactivity]

Merriam Webster's

noun Etymology: International Scientific Vocabulary Date: 1899 the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei; also the rays emitted

Oxford Reference Dictionary

n. the spontaneous disintegration of atomic nucleii, with the emission of usu. penetrating radiation or particles.

Collin's Cobuild Dictionary

see radioactive

Moby Thesaurus

activity, artificial radioactivity, contamination, curiage, decontamination, fallout, half-life, natural radioactivity, nuclear radiation, radiant energy, radiation, radioactive radiation, radiocarbon dating, radiolucency, radiopacity, radiosensibility, radiosensitivity, saturation point, specific activity



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