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Meaning of RADIOACTIVITY in English
  1. the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
  2. The property of some atomic nuclei of spontaneously emitting gamma rays or subatomic particles (a and ß rays) by the process of nuclear disintegration and measured in disintegrations per second (dps). one dps is equal to 1 becquerel, and 3.7 × 10
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Usage of "RADIOACTIVITY" in sentences

  1. "The radioactivity was being swept upwards by the air current and out into the atmosphere"

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