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Regulation and control methods for the unattached fraction of 220Rn progeny in a 220Rn progeny chamber
Journal of Environmental Radioactivity ( IF 2.3 ) Pub Date : 2021-05-26 , DOI: 10.1016/j.jenvrad.2021.106653
Jian Lin , Detao Xiao , Zhengzhong He , Shicheng Li , Yuanyuan Zhang , Zhen Wang , Bo Yu

The unattached fraction of 220Rn progeny is one of the key parameters in lung dose evaluation models. To study the behavior of unattached 220Rn progeny and to prepare for calibration of the unattached 220Rn progeny monitors, a 220Rn progeny chamber that could stably regulate different unattached fractions of 220Rn progeny was established. A recirculation loop to eliminate the effects of the sampling and a loop connected to the dilution chamber to supplement the carrier aerosol were set up. Also, a theoretical model regarding the regulation of the unattached fraction of 220Rn progeny was established. Continuous measurements of the unattached fraction were conducted using the combination of a single-layer wire screen and a filter membrane. The experimental results showed that, under different aerosol levels, the relative standard deviation (RSD) of 212Pb concentration during the continuous samplings was within 10.7% and the RSD of the unattached fraction of 212Pb was within 9.9%. The relative deviation between the theoretical and the experimental values of 212Pb concentration was within 16.7% and the model calculation values of the unattached fraction of 212Pb were consistent with measured results.



中文翻译:

220 Rn子代室中220 Rn子代的未附着部分的调控方法

220 Rn后代的未结合部分是肺部剂量评估模型中的关键参数之一。为了研究未附着的行为220 Rn中的子代,并为未连接的校准制备220个Rn中的子代监视器,一个220 Rn中后代室,可以稳定地调节不同独立的级分220成立Rn中后代。建立了一个消除采样影响的再循环回路和一个连接到稀释室以补充载体气溶胶的回路。另外,关于220的独立分数的调节的理论模型Rn后代成立。使用单层金属丝网和滤膜的组合进行未附着部分的连续测量。实验结果表明,在不同的气溶胶水平下,连续采样期间212 Pb浓度的相对标准偏差(RSD)在10.7%以内,而未附着的212 Pb组分的RSD在9.9%以内。212 Pb浓度的理论值与实验值之间的相对偏差在16.7%之内,并且212 Pb的未附着级分的模型计算值与测量结果一致。

更新日期:2021-05-26
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