Radiation profile mapping and health impact assessment due to ²²²Rn exposure from groundwater in coal mining city Asansol, West Bengal, India

²²²Rn activity was measured in Asansol city and the adjacent mining area, West Bengal, India. ²²²Rn concentrations were found to vary in the range 6.4-145, 1080-91002, and 2070-180000 Bqm^-3 in indoor air, soil gas, and groundwater, respectively. Total effective doses (TEDs) due to ²²²Rn exposure were also estimated. In some sampling locations, TEDs appear to exceed the maximum permissible limit (100 µSvy^-1). ²²²Rn concentration variation contour mapping was prepared. Carcinogenic health risk factors (HRF) due to ²²²Rn activity were also estimated. In some places, HRFs are found to be very high (> permissible limit ∼ 1.0). (author)