The measurement of 222Rn and 220Rn concentrations in air was carried out in 50 dwellings belonging to 20 locations in and around Mandya city, Karnataka,India. Annual mean values of 222Rn and 220Rn concentrations were found to be 22.4 1.5 and 24.1 1.8 Bq/m3, respectively. The total annual effective dose received by the general public due to radon and thoron was found to be 1.36 0.08 mSv/y. The doses to different organs and tissues were calculated using the International Commission on Radiological Protection (ICRP) model of the respiratory tract and inter-comparison was made. The flooring,...