Department of Chemistry, Alpine Institute of Management and Technology, Dehradun 248007, India.
Department of Chemistry, HNB Garhwal University, SRT Campus, Tehri 249199, India.
Radiat Prot Dosimetry. 2024 Jul 17;200(11-12):1018-1026. doi: 10.1093/rpd/ncad322.
The noble radioactive gas radon and its isotope thoron dominate terrestrial radiation in the indoor environment. These gases eventually disintegrate generating radioactive ions that readily adhere to aerosol particles. This study was conducted in a tectonically active location with significant radon concentrations. The obtained average values of radon mass exhalation and thoron surface exhalation rate from this study are higher than the global average values of 56 mBq kg-1 h-1 and 1000 mBq m-2 s-1, respectively. As the exhalation rates are higher, naturally the average radon and thoron concentrations are also greater than the worldwide average values of 40 and 10 Bq m-3, respectively. No significant correlation was observed between 222Rn and 220Rn exhalation rate and indoor 222Rn/220Rn concentration. The exposure dose due to 222Rn, 220Rn and their progenies shows no significant health risk.
氡和钍射气这两种高贵的放射性气体主导着室内环境中的陆地辐射。这些气体最终会分解生成放射性离子，这些离子很容易附着在气溶胶颗粒上。这项研究是在一个构造活跃且氡浓度很高的地方进行的。本研究获得的氡质量扩散和钍射气表面扩散率的平均值高于全球平均值，分别为 56 mBq kg-1 h-1和 1000 mBq m-2 s-1。由于扩散率较高，氡和钍射气的平均浓度也高于全球平均值，分别为 40 和 10 Bq m-3。没有观察到 222Rn 和 220Rn 扩散率与室内 222Rn/220Rn 浓度之间存在显著相关性。由于 222Rn、220Rn 及其子体产生的照射剂量没有显示出显著的健康风险。
