Wang Yunxiang, Zhang Lei, Yang Zhijie, Guo Qiuju, Liang Juncheng
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, China.
State Key Laboratory of NBC Protection for Civilian, Beijing, China.
Radiat Prot Dosimetry. 2019 Oct 1;184(3-4):413-417. doi: 10.1093/rpd/ncz110.
An intercomparison experiment of three radon progeny measurement methods, based on alpha spectrometry (Kerr method), alpha-beta spectrometry and liquid scintillation counter (LSC method), was carried out in the standard radon chamber at NIM. Both the consistency and the uncertainty analysis of three different methods were studied in detail. Results show that, at the EEC level of 4000 Bq/m3, the uncertainties of the alpha-beta spectrometry, LSC method and Kerr method were 3.78%, 6.41% and 9.46%, respectively, which are mainly contributed by detection efficiency uncertainty, measuring time uncertainty and counting statistical uncertainty in sequence. The comparison results at different concentration levels show that the measurement values of three methods are consistent within the error range of 3%. The alpha-beta spectrometry can be used as a reference standard method to achieve the simultaneous measurement of RaA, RaB, RaC concentrations and EEC in the radon chamber.
在中国计量科学研究院的标准氡室内，开展了基于α能谱法（克尔法）、α-β 能谱法和液体闪烁计数器（LSC 法）的三种氡子体测量方法的比对实验。详细研究了三种不同方法的一致性和不确定度分析。结果表明，在平衡当量浓度（EEC）为 4000 Bq/m³ 时，α-β 能谱法、LSC 法和克尔法的不确定度分别为 3.78%、6.41% 和 9.46%，其不确定度主要依次由探测效率不确定度、测量时间不确定度和计数统计不确定度构成。不同浓度水平下的比对结果表明，三种方法的测量值在 3% 的误差范围内一致。α-β 能谱法可作为参考标准方法，实现氡室内 RaA、RaB、RaC 浓度和 EEC 的同时测量。
