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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.
 放射能

radioactive adjective

  /ˌɹeɪdioʊˈæktɪv/ , /ˌɹeɪdiəʊˈaktɪv/
  • Exhibiting radioactivity.
 放射性(の)
radioactive waste
放射性廃棄物
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