| Qin Weihao,Ye Zhenglin,Tuo Fei,et al.Full-process comparison of gamma-ray spectrometry[J].Chinese Journal of Radiological Medicine and Protection,2026,46(6):592-598 |
| Full-process comparison of gamma-ray spectrometry |
| Received:November 28, 2025 |
| DOI：10.3760/cma.j.cn112271-20251128-00416 |
| KeyWords:Gamma spectrometer|Soil|Comparison |
| FundProject:国家市场监督管理总局科技计划项目(2024CNAS25) |
| Author Name | Affiliation | E-mail | | Qin Weihao | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Ye Zhenglin | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Tuo Fei | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Yang Baolu | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Li Zeshu | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Kong Shuying | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Zhou Qiang | China CDC Key Laboratory of Radiological Protection and Nuclear Emergency, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | zhouqiang@nirp.chinacdc.cn |
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| Abstract:: |
| Objective To conduct an exploratory gamma-ray spectrometry intercomparison exercise between reference laboratories which independently performed sample collection and preparation, with aim to evaluate their technical capabilities across the entire process. Methods To ensure samples contain adequate levels of radionuclides, the sampling site was selected in the high-background area of Yangjiang, Guangdong province. Based on the testing capabilities of gamma-ray spectrometry laboratories within the health system, nine laboratories were organized to conduct on-site sampling and perform gamma-ray spectrometry. Three laboratories with good performance in previous gamma-ray spectrometry intercomparisons were selected to determine the reference values using a grouped cross-calibration approach, with the calibration process completed using a unified soil standard sample. The En value evaluation method recommended in the national standard was employed to determine whether each laboratory's result met the required standards. Results Nine reference laboratories reported detection result for 36 radionuclides. Three calibration laboratories completed the reference value determination. the specific activity ranges of 226Ra,137Cs,232Th,and 40K were 72-103, 1.04-2.33, 201-490 and 122-175 Bq/kg, respectively. Technical issues identified during the intercomparison were corrected. All result ultimately met the required standards. Conclusions This proficiency testing examined additional aspects of gamma-ray spectrometry analysis, identifying potential interactions among naturally occurring radionuclides and analytical interferences in measuring low-activity nuclides. Timely alerts and corrections were implemented, enhancing detection capabilities in these areas and achieving the objective of the proficiency testing exercise. |
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