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This study reports the 222Rn, 220Rn, and their progeny concentration in Shivamogga district by using SSNTD's based pin hole dosimeters and deposition-based progeny sensor. The average indoor 222Rn and 220Rn concentration varies from 8.14 to 146 Bq m−3 and 13.01 to 157 Bq m−3 with a mean value of 60.61 and 61.77 Bq m−3. The EEC for 222Rn and 220Rn ranges from 1.55 to 19 Bq m−3 and 0.44 to 6 Bq m−3 with a mean value of 7.29 and 2.66 Bq m−3. The annual average equilibrium factor for 222Rn is well within the global mean values of 0.4, while the thoron is bit higher than specified global mean values of 0.02. The annual effective dose varies from 0.31 to 2.5 mSvy−1 with a mean value of 1.1 mSvy−1. [ABSTRACT FROM AUTHOR]

The indoor 222Rn and 220Rn were measured by using deposition progeny sensors and single-entry pinhole dosimeter around Kolar Gold Fields of Karnataka state, India. The thirty different places were identified and fixed the dosimetry cups for the determination. The 222Rn and 220Rn concentrations of indoor environment range from 26.2 ± 1.3 to 138.4 ± 1.6 and 21.2 ± 0.8 to 133.3 ± 1.5 Bq/m3 with a mean value of 68.8 ± 1.6 and 61.8 ± 1.5 Bq/m3, respectively. The equivalent concentrations of 222Rn and 220Rn values vary from 0.9 ± 0.4 to 7.6 ± 1.1 and 6.8 ± 0.8 to 19.8 ± 1.8 Bq/m3 with a standard value of 4.3 ± 0.8 and 14.2 ± 1.3 Bq/m3, respectively. The values between the equilibrium factor between 222Rn, 220Rn, and their daughter were also calculated and found to be 0.23 and 0.07, respectively. The average annual intake of 222Rn, 220Rn, and their daughters' products is 2.28 mSv/y1, slightly below the global average of 2.4 mSv/y1 from all components. The data obtained compare average values in the world. [ABSTRACT FROM AUTHOR]

In this study pin hole dosimeter with deposition based progeny sensors were used to estimate 222Rn, 220Rn and their daughters in the indoor atmosphere. The estimated annual average indoor 222Rn and 220Rn activity concentration were found to be 76.4 Bq m−3 and 93.5 Bq m−3, respectively. The mean value of EEC for radon and thoron was 45.5 Bq m−3 and 1.3 Bq m−3 respectively. The annual effective dose due to indoor 222Rn and 220Rn were found to be 2.9 mSv y−1 and 0.4 mSv y−1 respectively. The estimated effective doses are well below the safe limit as suggested by ICRP for indoor exposure. [ABSTRACT FROM AUTHOR]