In this study 222Rn (Radon) measurement were performed in water and soil gas and also both 222Rn and 220Rn concentrations were determined in air of Mansa and Muktsar district of Punjab, India. The data then used for calculation of the annual effective dose for health risk assessment of public. Totally 35 locations have been selected for the measurements. All measurements (222Rn and 220Rn) were done with RAD7 detection system. The 222Rn concentration in the water of studied area varies from 0.4 ± 0.2 Bq l-1 to 17 ± 2.8 Bq l-1. The average value of 222Rn concentration in soil, 222Rn and 220Rn concentrations in indoor air are 8 ± 3 kBq m-3, 47 ± 21 Bq m-3 and 39 ± 19 Bq m-3, respectively. The total average annual effective dose for water samples is 13 μSv a- 1 and for indoor air samples is 2.3 mSv a-1. It has been observed that 222Rn concentration in water has increased with depth of groundwater
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