Dose estimation derived from the exposure to radon, thoron and their progeny in the indoor environment.
Dose estimation derived from the exposure to radon, thoron and their progeny in the indoor environment.
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DOI：
10.1038/srep31061
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发表时间：
2016-08-08
影响因子：
4.6
通讯作者：
Tokonami S
中科院分区：
文献类型：
--
作者：
Ramola RC;Prasad M;Kandari T;Pant P;Bossew P;Mishra R;Tokonami S
每年对室内氡、钍及其子代的暴露对公众的吸入剂量有很大贡献。在本研究中，我们报告了在Garhwal喜马拉雅地区进行的室内氡、钍及其后代浓度的时间综合被动测量结果，目的是调查该地区居民的重大健康风险。测量使用了最近开发的基于LR-115探测器的技术。氡、钍及其子体浓度的实验测定值用于估计年吸入总剂量和年有效剂量。并根据实测资料确定了氡和钍的平衡因子。年吸入总剂量的估计值为1.8±0.7 mSv/y。年有效剂量估计值分别为1.2±0.5毫西弗/年和0.5±0.3毫西弗/年。辐射剂量估计值表明，在研究区域内，氡、钍及其子代的暴露不会造成重大的健康风险。室内刺及其子代对总吸入剂量的贡献在13 ~ 52%之间，平均值为30%。因此，在评估辐射剂量时不能忽视钍。
The annual exposure to indoor radon, thoron and their progeny imparts a major contribution to inhalation doses received by the public. In this study, we report results of time integrated passive measurements of indoor radon, thoron and their progeny concentrations that were carried out in Garhwal Himalaya with the aim of investigating significant health risk to the dwellers in the region. The measurements were performed using recently developed LR-115 detector based techniques. The experimentally determined values of radon, thoron and their progeny concentrations were used to estimate total annual inhalation dose and annual effective doses. The equilibrium factors for radon and thoron were also determined from the observed data. The estimated value of total annual inhalation dose was found to be 1.8 ± 0.7 mSv/y. The estimated values of the annual effective dose were found to be 1.2 ± 0.5 mSv/y and 0.5 ± 0.3 mSv/y, respectively. The estimated values of radiation doses suggest no important health risk due to exposure of radon, thoron and progeny in the study area. The contribution of indoor thoron and its progeny to total inhalation dose ranges between 13–52% with mean value of 30%. Thus thoron cannot be neglected when assessing radiation doses.