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radioactivity noun

  /ˌreɪdɪəʊakˈtɪvɪti/
  • Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
  • The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.
 radioattività

radioactive adjective

  /ˌɹeɪdioʊˈæktɪv/ , /ˌɹeɪdiəʊˈaktɪv/
  • Exhibiting radioactivity.
 radioattivo
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