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Definitions
radioactivity Tweet Definition of radioactivity Like Definition of radioactivity on Facebook
noun 
  1. Spontaneous emission of 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: 
  • French: radioactivité
  • German: Radioaktivití¤t
  • Italian: radioattivití 
  • Spanish: radioactividad
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