Abstract
Studies concerning measurements of indoor radon levels were carried out in 60 schools inthe Rawalpindi region of Pakistan. In each school, six CR-39 based NRPB type radondetectors were installed and exposed to the indoor radon in two cycles (each of six months’duration). After exposure, the detectors were removed, etched in 6 M NaOH for 16 h at80 °C, and the tracks were counted under an optical microscope. The measuredtrack densities were then related to radon concentrations, from which theradiation doses were calculated. The observed radon concentrations varied from15 to140 Bq m−3, with an average activityconcentration of 42.75 ± 9.28 Bq m−3. The mean annual radon effective dose equivalent was found to be0.40 ± 0.09 mSv using an occupancyfactor of 8 h day−1. Our results show that the indoor radon concentrations in the schools surveyed are withinthe permissible limits.
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