摘要
目的 检验全国放射卫生技术机构γ能谱实验室对放射性核素的测量和分析能力，确保放射性核素γ能谱测量结果的质量。方法 开展2016年度放射性核素γ能谱分析能力考核工作，总结并分析全国放射卫生技术机构γ能谱实验室测量土壤样品中放射性核素232Th、40K和137Cs活度浓度的准确性与精确度。结果 本次考核一共收到45份回执，提交的有效结果报告为43份，其中2家机构中止考核，不计入本次考核结果统计。所有机构给出232Th、40K和137Cs的活度浓度值与参考值的相对偏差大部分都在±20%以内，有两个测量值相对参考值的偏差超出20%，其超出的原因可能是效率刻度不准确而导致，但经过判定，43家参加考核机构的结果都合格，整体合格率为100%，其中优秀的机构有5家，优秀率为11.6%。结论 所有机构提交的考核结果准确，反映出较好地检测水平。但一些机构的考核结果与参考值的相对偏差较大，今后需要加强实验操作及数据处理的规范，从而提高测量结果的准确度和精确度。
Objective To evaluate the radionuclide measurability and analyzability of the γ-spectrometry laboratories in radiological technology institutions countrywide, ensure the quality of radionuclide γ-spectrometry and outlook the evaluation work in γ-spectrometry. Methods The 2016 annual evaluation of radionuclide γ-spectrometry was carried, and the accuracy and precision of 232Th, 40K and 137Cs, activity concentration in soil samples were summarized and analyzed in γ-spectrometry laboratories of radiological technology institutions countrywide. Results Of received 45 revaluation receipts, 43 were effective and the other two were ineffective due to the suspension of the evaluation. The relative deviation of the activity concentration values of 232Th, 40K and 137Cs given by most of the institutions were within the range of ±20%, only with two measurements beyond 20%. The evaluation results from the 43 participants were qualified with the overall qualified rate of 100%, of which five were excellent accounting for 11.6% of all. Conclusions All of the elevation results submitted were accurate, showing better measurability. However, some submittals deviated from the references to some degree. Henceforth, it is necessary to strengthen experimental operation and data processing according to the defend procedures and improve the accuracy and precision of measurement results.
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2017年第12期928-932,共5页
Chinese Journal of Radiological Medicine and Protection
关键词
放射性核素
Γ能谱
相对偏差
Z值
U值
Radionuclides
γ-spectrometry
Relative deviation
Z-score
U-score
