radioactivity

English

Etymology

radioactive +‎ -ity

Noun

radioactivity (usually uncountable, plural 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.

Translations
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See also

Further reading
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