radioactivity

Noun
  1. The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay (synset 113566387)
    is a type of: emission - the release of electrons from parent atoms
    subtypes: corpuscular radiation, particulate radiation - a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)
    same as: radiation

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