radioactivity

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English[edit]

Etymology[edit]

radioactive +‎ -ity

Noun[edit]

radioactivity (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.

Related terms[edit]

Translations[edit]

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See also[edit]

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