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.

中文翻译：

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对室内大气中氡 (222Rn) 和钍 (220Rn) 的附着和未附着部分暴露的放射剂量评估

在这项研究中，带有基于沉积的子代传感器的针孔剂量计用于估计室内大气中的 222Rn、220Rn 及其子代。估计的年平均室内 222Rn 和 220Rn 活动浓度分别为 76.4 Bq m-3 和 93.5 Bq m-3。氡和钍的 EEC 平均值分别为 45.5 Bq m-3 和 1.3 Bq m-3。室内 222Rn 和 220Rn 的年有效剂量分别为 2.9 mSv y−1 和 0.4 mSv y−1。估计的有效剂量远低于 ICRP 建议的室内暴露安全限值。