Abstract
An evaluation was made of the radiological health hazard arising from inhalation of radioactive concrete dust, from a barytes aggregate concrete used for nuclear reactor shielding. This study involved (1) generation of airborne concrete dust particulates, collection and sizing of the particulates; (2) thermal neutron irradiation of the dust samples; and (3) measurement of the induced radioactivity samples. It was found that inhalation of airborne activated concrete dust for several hours, at concentrations that may be encountered in practice, may be hazardous by ICRP occupational safety criteria, unless appropriate action is taken to reduce exposure.