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Studies on indoor radon and its progeny levels around Bangalore rural district and Bangalore city

C.Ningappa, J.Sannappa, M.S.Chandrashekara, L.Paramesh

Indoor radon and its progeny levels were measured during 2005-2006 around Bangalore rural district and in Bangalore city using Solid State Nuclear Track Detector based dosimeters.More than 50 dwellings of different construction and types were chosen for the study in and around the city. The geometrical mean value of radon concentration level in indoor atmosphere of granite quarries varies from 55 Bq.m-3 to 300 Bq.m-3 with a median of 152.5 Bq.m-3 and its progeny varies from0.24 to 19.6mWLwith a median of 8 mWLrespectively. In Bangalore city the concentration level of radon varies from18.4 Bq.m-3 to 104 Bq.m-3 with amedian of 45 Bq.m-3 and its progeny varies from1.62 to 11.24mWLwith amedian of 4.78mWL respectively. Higher concentration of radon and its progenywere observed in granite quarries compared to Bangalore city due to the mining activity and types of the bedrock in granite quarries.