radioactivity

Meanings

Plural: radioactivities

Noun

the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
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.

Origin / Etymology

From radioactive + -ity.

Synonyms

radiation

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