On exposure to air-borne particulate activity in a radiological laboratory

This paper attempts to evaluate different exposure scenarios in a laboratory having once through ventilation. It has been considered a laboratory of volume V (m³) which has once through ventilation rate of λ(hr^-1). It is assumed that a certain amount, q Bq, of long lived activity has got released into the laboratory and the air-bone activity instantaneously got distributed throughout the volume of the laboratory. In the study a simple mathematical expression is applied for the source term for generic cases of containment breach leading to air-borne activity. It is analysed, considering different time duration of release as less than total time of exposure, for duration of 7 hour exposure