2014年度全国放射性核素γ能谱分析质量控制比对

拓飞; 张庆; 张京; 周强; 李文红; 徐翠华; 苏旭

doi:10.3760/cma.j.issn.1673-4114.2015.05.011

2014年度全国放射性核素γ能谱分析质量控制比对

Nationwide intercomparison for radionuclide analyses through γ-spectrometry method in 2014

摘要

摘要:
目的提高放射卫生技术服务机构检测人员的技术水平和分析能力，进一步促进全国γ能谱实验室放射性核素检测技术的发展。
方法组织2014年度全国放射性核素γ能谱分析方法比对，比对基质为土壤样品，要求参加比对的单位分析测量样品中放射性核素⁴⁰K、¹³⁷Cs、²⁰⁸Tl和²²⁸Ac的比活度。
结果提交结果报告的31家比对单位中，比对结果合格的有26家，不合格的有5家，有2家单位的比对结果获得优秀。所有参加比对的单位的整体合格率为84%（26/31），优秀率为6%（2/31）。
结论参加比对的多数单位具备较高的检测能力和水平，其出具的检测结果准确可靠。在日常工作中需加强对γ谱仪的维护保养，重视实验室间定期刻度，并注意采用正确的核衰变参数进行计算。

Abstract:
Objective To improve the technical levels and analytical ability of γ-spectrometry analysts for agencies engaged in radiation measurement and assessment and to promote further advances of monitoring methods for γ-spectrometry analysis laboratories in our nation.
Methods A nationwide intercomparison on γ-spectrometry measurement for activity concentration of ⁴⁰K, ¹³⁷Cs, ²⁰⁸Tl, and ²²⁸Ac in soil was organized in 2014.
Results Thirty-one laboratories have participated in this intercomparison. Among these laboratories, 26 laboratories showed"acceptable" results, which include 2 laboratories with "excellent"status, while 5 laboratories showed "unacceptable" results. The production percentages of "acceptable"results and"excellent"status are 84%(24/31) and 6%(2/31), respectively.
Conclusions The measurement values reported by most of the laboratories involved in this intercomparison showed a good agreement with the reference values. Therefore, these values may provide a reliable measurement result during measurement in γ-spectrometry analyses. However, proper operation of γ-spectrometers and its regular calibration must be further emphasized to obtain accurate measurements to improve the calculation of nuclear data in some laboratories.

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