2008年全国放射性核素γ能谱分析比对  

Nationwide intercomparison of ^226Ra,^232Th and ^40K for soil and building material by γ-spectrometry analyses in 2008

作　　者：拓飞[1] 徐翠华[1] 张京[1] 张庆[1] 李文红[1] 

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所,北京100088

出　　处：《中华放射医学与防护杂志》2010年第3期343-345,共3页Chinese Journal of Radiological Medicine and Protection

基　　金：卫生部卫生行业科研专项资助（200802018）

摘　　要：目的 组织全国省、直辖市的疾病预防控制中心进行γ能谱比对,提高实验室放射性核素检测水平.方法 中国疾病预防控制中心辐射防护与核安全医学所组织了2008年全国放射性核素γ能谱分析方法比对,比对样品为土壤和建材样品,参加比对的15家单位测量其中的^226Ra、^232Th和^40K的比活度浓度.结果 15家单位一次性提交的结果,有13家单位全部合格,仅有1家单位2个样品中^40K的准确度超出判定范围,另外1家单位2个样品中的^226Ra精确度超出了判定范围.经反馈意见查找原因后,各参加比对单位第二轮提交的比对结果均能满足比对合格条件.结论 经过比对绝大部分单位的整体检测能力得到了明显的提高.本次比对既检验了各单位分析放射性核素的水平,又进一步提高了其利用γ能谱测量样品的能力.Objective To assess the accuracy and precision of γ-spectrometry analysis, and to obtain accurate and valid measurement results in the middle term and long term. Methods A nationwide intercomparison on gamma-ray spectrometry measurement of activity concentration of ^226Ra, ^232Th and ^40K in soil and building material was organized by National Institute for Radiological Protection（ NIRP） , China CDC. Results 15 laboratories participated in this intercomparison, with 13 laboratories produced acceptable results. Only 2 laboratories were classified as ＂ not acceptable＂ , including one for inappropriate accuracy in determination of ^40K and another for inappropriate precision determination of ^ 226Ra in both kinds of the samples. Through comment and discussion, the second round intercomparison got satisfactory results. Conclusions The overall measurement results of samples for intercomparison are in close agreement with the reference values. Most of the laboratories involved in the intercomparison have good ability in γ-spectrometry analysis.

关 键 词：Γ能谱 比对 土壤 建材 天然放射性核素 

分 类 号：R144[医药卫生—公共卫生与预防医学]