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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
The DAC is the activity concentration in air in Bq m^(<sup>-3)</sup> of the radionuclide considered that would lead to intake of an [[annual limit on intake ]] (ALI) assuming a sex-averaged breathing rate of 1.1 m^<sup>3 </sup> h^(<sup>-1) </sup> and an annual working time of 2000 h. DAC is given by:
<math>
=== Historically ===
The activity concentration in air (Bq m<sup>-3</sup>) of a radionuclide that would lead to an intake of an ALI (Bq) assuming a sex-averaged breathing rate of 1.1 m<sup>3</sup> h<sup>h-1</sup> and an annual working time of 2000 h.