Radioactivity
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The property of an unstable atomic nucleus losing energy by emitting radiation (radioactive decay). Radioactivity also refers to the expectation value of the number of radioactive decays occurring in a given quantity of material per unit time. The SI unit of radioactivity is per second (s-1) and its special name is becquerel (Bq). Also called activity.
ICRP Glossary entry - June 2019
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