RADIOACTIVITY

radiation, radioactivity

(noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay

Source: WordNet® 3.1

Etymology

Noun

radioactivity (usually uncountable, plural radioactivities)

Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.

The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.

Source: Wiktionary

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