Department of Physics, DAV College, Amritsar, Punjab, 143001, India.
Department of Physics, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India.
Environ Sci Pollut Res Int. 2018 Apr;25(12):11440-11453. doi: 10.1007/s11356-018-1414-7. Epub 2018 Feb 8.
Indoor radon and thoron concentrations in the domestic environment result in natural radiation exposure to the public due to the inhalation of their short-lived decay products. Keeping this in view, the annual effective dose and other radiation risks due to radon/thoron progenies have been calculated. In this study, newly developed time deposition-based progeny sensors (DTPS/DRPS) were used for long-term passive determination of progeny concentrations in the environment of Jammu and Kashmir, Himalayas, India. The total equilibrium equivalent radon (EECR) and thoron (EECT) concentrations ("A" and "U" referring to attached and unattached fractions) were found to vary from 5 to 38 Bq m with an average value of 18 Bq m and from 0.48 to 5.49 Bq m with an average value of 1.69 Bq m, respectively. The aerosol concentration, equilibrium factors, and unattached fractions for radon and thoron progeny have been estimated in normal living conditions and their dependence on each others have also been studied. The annual equilibrium factor for radon and thoron progeny has been determined from the calculated data. The estimated annual effective dose due to radon progeny (0.34 to 2.42 mSv y) and thoron progeny (0.13 to 1.54 mSv y) is found to be below the world's recommended level. Based on measurements of mean values of the unattached fraction, dose conversion factors (DCFs) in units of mSv per working level month (WLM) has been calculated and the average calculated values of DCFs are 24, 10, and 13 mSv WLM. The variability of equilibrium factor and radon/thoron progeny with different seasons, ventilation conditions, and types of houses were also analyzed.
室内氡和钍浓度会导致其短寿命衰变产物被公众吸入，从而使公众受到自然辐射照射。有鉴于此，已计算了由于氡/钍子体导致的年有效剂量和其他辐射风险。在这项研究中，使用了新开发的基于时间沉积的子体传感器（DTPS/DRPS），用于长期被动测定印度喜马拉雅山脉查谟和克什米尔地区环境中的子体浓度。总平衡等效氡（EECR）和钍（EECT）浓度（“A”和“U”分别指的是附着和非附着部分）的范围为 5 到 38 Bq/m，平均值为 18 Bq/m，范围为 0.48 到 5.49 Bq/m，平均值为 1.69 Bq/m。在正常生活条件下，估计了氡和钍子体的气溶胶浓度、平衡因子和非附着部分，并研究了它们之间的相互依赖关系。从计算数据中确定了氡和钍子体的年平衡因子。由于氡子体（0.34 到 2.42 mSv/y）和钍子体（0.13 到 1.54 mSv/y）导致的估计年有效剂量低于世界推荐水平。基于非附着部分平均值的测量，计算了单位为毫希沃特每工作水平月（WLM）的剂量转换因子（DCF），平均计算的 DCF 值分别为 24、10 和 13 mSv/WLM。还分析了平衡因子和氡/钍子体随不同季节、通风条件和房屋类型的变化。
