Abstract
The natural background gamma radiation levels were measured in dwellings of urban Hassan city & its surrounding Taluks, Karnataka state, using environmental radiation Dosimeter ER-709. The recorded gamma dose rate in indoor atmosphere was found to vary from 87 nGy.h-1to 487 nGy.h-1 with a mean value of 288.6±102 nGy.h-1. In outdoor atmosphere it was found to vary from 78.3 nGy.h-1to 461nGy.h-1 with an average value of 260.4±88 nGy.h-1. It was observed that the dose rates are higher in Channarayapatna Taluk and in Hassan City and lower in the place of Halebeedu and Belur. The absorbed dose at different mines and granite factories were found to vary from 304.5 nGy.h-1to 583 nGy.h-1with an average value of 434.6 nGy.h-1. The Annual effective dose due to natural background gamma radiation exposure in the Hassan city and its surrounding Taluks is calculated and found to be 0.67 mSv.y-1 & 2.90 mSv.y-1with mean value of 1.735±0.56 mSv.y-1. This is higher than the global average
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