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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
The number of nuclear transformations of a radioactive material during an infinitesimal time interval divided by its duration (s). The SI unit of activity is s<sup>-1</sup> and its special name is [[becquerel]] (Bq).
([[ICRP Publication 133]], 2016)