| 周强,拓飞,张京,等.水样品放射性核素γ能谱分析的比对与评价[J].中华放射医学与防护杂志,2017,37(9):700-704.Zhou Qiang,Tuo Fei,Zhang Jing,et al.Intercomparison and evaluation on γ-spectrometry of radionuclides in water[J].Chin J Radiol Med Prot,2017,37(9):700-704 |
| 水样品放射性核素γ能谱分析的比对与评价 |
| Intercomparison and evaluation on γ-spectrometry of radionuclides in water |
| 投稿时间：2017-02-15 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.09.012 |
| 中文关键词: 比对 γ能谱 放射性核素 |
| 英文关键词:Intercomparison γ-spectrometry Radionuclides |
| 基金项目:科技部基础性工作专项资金（2014FY211000）。 |
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| 中文摘要: |
| 目的 通过在重点实验室间开展γ能谱测量分析比对活动，改进水样品的γ能谱分析技术。方法 参加中国计量科学研究院组织的水样品中γ能谱测量分析比对。样品中238U、 226Ra、208Tl、228Ac、40K、241Am、137Cs、60Co被检出。为分析比对结果，2015年又采用新制备的水标准源重新进行了效率刻度，并且采用了1台新购进的γ能谱仪（BE5030）重新测量了比对样品。结果 比对样品3次测量结果与主导实验室参考值的分析比较，发现采用γ能谱仪（BE5030）测量分析的结果较好，特别是天然核素结果，与参考值的最大En值仅为0.71。结论 宽能高纯锗γ能谱仪（BE5030）在天然放射性核素的测量分析方面优势明显，并且由于其探测器的结构特点，使得其在低能区本底干扰更少。此次比对改进了本实验室样品测量分析的准确性，取得了良好的效果。 |
| 英文摘要: |
| Objective To improve the γ-spectrometry analysis technology in water sample through the intercomparison conducted among the key laboratories.Methods To take part in the intercomparison of γ-spectrometry analysis in water sample organized by National Institute of Metrology (NIM), the radionuclides of 238U, 226Ra, 208Tl, 228Ac, 40K, 241Am, 137Cs, and 60Co in water sample were determined. The efficiency of the detector was calibrated renewedly by new standard source in 2015 and a new γ-spectrometry (BE5030) was used for sample measurement.Results Analysis and comparison of the three measurement results and the leading laboratory reference values showed that the results measured by γ-spectrometry (BE5030) were better, especially for the natural radionuclides. The maximum En value between them and NIM reference value was only 0.71.Conclusions The wide range energy γ-spectrometry (BE5030) has obvious advantages in the measurement and analysis of natural radionuclides. Due to the special structure of the wide range energy detector, its background interference is less in low energy area. This inter-comparison improved the accuracy of sample measurements and analysis, with good result achieved. |
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