Abstract
In this article, internal CRn measure have been carried out in twenty-three locations various rooms and Laboratory of Department Physics in science college in the university of Mustansiriyah. CRn were measure by Rad-7 detector. The results show that, the maximum CRn in indoor rooms was found in Electronics Laboratory (64.9 Bq/m3), whilst the minimum CRn was found in room rapporteur of higher studies (2) / Department of Physics (24.3 Bq/m3), which was lower (200-300Bq/m3) indoor air and the value of parameters hazard indices were lower than the value of permissibility limit.
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