由白炽气罩制成的流通式钍射气源发射功率的实验研究。
The experimental study on the emanation power of a flow-through thoron source made from incandescent gas mantles.
作者信息
Wang Yunxiang, Zhang Lei, Guo Qiuju
机构信息
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People's Republic of China.
出版信息
J Radiol Prot. 2017 Dec 18;37(4):918-926. doi: 10.1088/1361-6498/aa869a.
To improve the quality of the calibration of thoron concentration activity measurement, an experimental study on the emanation power of a flow-through thoron source based on incandescent gas mantles was carried out in this paper. The thoron activity concentrations of the outflowed air from the flow-through source were measured using RAD7, and the quantitative relationship between thoron concentrations and flowrates was studied through theoretical analysis, and the thoron emanation powers were obtained from the fitting of the relationship above. Results show that the thoron concentration decreased with the increasing flowrate in the gas path, and the thoron emanation powers of three batches of gas mantles obtained by fitting were 1.33% ± 0.17%, 0.77% ± 0.10% and 0.57% ± 0.07% respectively in low humidity condition. Those results were checked using the gamma spectroscopy method, and were consistent within the error range.
为提高钍射气浓度活度测量的校准质量，本文开展了基于白炽气罩的流通式钍射气源发射率的实验研究。使用RAD7测量流通式源流出空气中的钍射气活度浓度，通过理论分析研究钍射气浓度与流量之间的定量关系，并通过上述关系的拟合得到钍射气发射率。结果表明，气路中钍射气浓度随流量增加而降低，在低湿度条件下，拟合得到的三批气罩的钍射气发射率分别为1.33%±0.17%、0.77%±0.10%和0.57%±0.07%。使用伽马能谱法对这些结果进行了检验，在误差范围内结果一致。
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