| 秦伟豪,叶政霖,拓飞,等.伽玛能谱分析全流程比对[J].中华放射医学与防护杂志,2026,46(6):592-598.Qin Weihao,Ye Zhenglin,Tuo Fei,et al.Full-process comparison of gamma-ray spectrometry[J].Chin J Radiol Med Prot,2026,46(6):592-598 |
| 伽玛能谱分析全流程比对 |
| Full-process comparison of gamma-ray spectrometry |
| 投稿时间：2025-11-28 |
| DOI：10.3760/cma.j.cn112271-20251128-00416 |
| 中文关键词: γ能谱仪|土壤|比对 |
| 英文关键词:Gamma spectrometer|Soil|Comparison |
| 基金项目:国家市场监督管理总局科技计划项目(2024CNAS25) |
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| 摘要点击次数: 1568 |
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| 中文摘要: |
| 目的 为检验参比实验室γ能谱测量分析全流程的技术能力,探索性地组织开展了由参比实验室自主采样和制样的γ能谱分析比对。方法 为保证样品具有一定的放射性核素含量,选取广东阳江高本底地区为采样现场。根据卫生系统γ能谱实验室检测能力,组织9家实验室人员赴现场自主采样,并进行γ能谱测量分析。选取3家既往γ能谱比对结果良好的实验室,以分组交叉定值的方式进行样品定值,定值过程由统一的土壤标准样品参与完成。采用国标中推荐的En值评判方法判定各家结果是否合格。结果 9家参比实验室上报了36个核素检测结果,3家定值实验室完成定值,从定值结果来看,检出的226Ra、137Cs、232Th、40K的比活度范围分别为72~103、1.04~2.33、201~490和122~175 Bq/kg,比对中纠正了相关技术问题,各家结果最终均达到了合格。结论 本次比对检验了更多γ能谱分析环节,发现天然放射性核素可能存在的相互影响,以及低活度核素测量的分析干扰等问题,并进行了及时的提醒和纠正,提升了相应方面的检测能力,达到了开展比对的目的。 |
| 英文摘要: |
| 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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