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radioactivity

Definition from Dictionary, a free dictionary
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English

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Etymology

radioactive + -ity

Noun

Singular
radioactivity

Plural
radioactivities

radioactivity (radioactivities)
  1. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
  2. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.

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