Abstract
In order to assess the effect of long term exposure, CR-39 based radon dosimeters were exposed to indoor radon in the drawing rooms (living room) of 200 selected houses of the districts of Swabi, Mardan and Charsadda in the North West Frontier Province (NWFP) as well as in the Mohmand and Bajuar Agencies of the federally administered tribal areas (FATA), Pakistan. Dosimeters were exposed to the indoor radon during each season as well as throughout the year. From the measured indoor radon data it was observed that seasonal yearly average value were higher than that of the 12 months average indoor radon concentration values. The overall seasonal average was found to be 13% higher than that of the 12 months exposed CR-39 based dosimeters. However after the removal of the worst differences, seasonal average remains only 8 % higher than the 12 months averaged value.
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