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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 ra·dio·ac·tiv·i·ty /-ækˈtɪvəti/
 放射現象,放射性

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 ra·dio·ac·tiv·i·ty /-ækˈtɪvətɪ/ 名詞
 放射性,放射性強度,放射現象,輻射性

From: WordNet (r) 2.0

 radioactivity
      n : the spontaneous emission of a stream of particles or
          electromagnetic rays in nuclear decay [syn: radiation]