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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
The product of the air concentration of a radionuclide to which a person is exposed (Bq m<sup>m-3</sup>) and the time of exposure. More generally when the air concentration varies with time the time integral of the air concentration of a radionuclide to which a person is exposed integrated over the time of exposure.
[[ICRP Publication 130]], 2015
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