食品样品密度差异对HPGeγ谱仪测量结果的影响

样品与标准源质量密度往往不一致。添加等量的放射性核素^232Th，制备6个密度梯次分布的食品样品，用高纯锗（HPGe）γ谱仪对。勉Th子体各谱线分别进行能谱分析，用全能峰面积净计数率比计算样品的相对自吸收校正系数。再用无源效率刻度软件Gammaclib对这6个密度样品进行建模仿真，拟合出各谱线效率，用效率比计算样品的相对白吸收校正系数。两种方法结果表明，食品样品与标准源的密度差异会对实验结果产生影响，需要进行自吸收校正。...

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Bibliographic Details
Published in核技术 Vol. 37; no. 1; pp. 34 - 37
Main Author 万永亮 铁列克 朱侠 刘默寒 刘金豪
Format Journal Article
LanguageChinese
Published 新疆出入境检验检疫局检验检疫技术中心 乌鲁木齐830063%新疆大学物理科学与技术学院 乌鲁木齐830046 2014
Subjects
探测效率
无源效率刻度
自吸收校正
高纯锗γ谱仪
自吸收校正
高纯锗γ谱仪
Self-absorption correction
Detecting efficiency
HPGe y-ray spectrometer
探测效率
无源效率刻度
Sourceless efficiency calibration method
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ISSN0253-3219

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Summary:样品与标准源质量密度往往不一致。添加等量的放射性核素^232Th，制备6个密度梯次分布的食品样品，用高纯锗（HPGe）γ谱仪对。勉Th子体各谱线分别进行能谱分析，用全能峰面积净计数率比计算样品的相对自吸收校正系数。再用无源效率刻度软件Gammaclib对这6个密度样品进行建模仿真，拟合出各谱线效率，用效率比计算样品的相对白吸收校正系数。两种方法结果表明，食品样品与标准源的密度差异会对实验结果产生影响，需要进行自吸收校正。
Bibliography:Background： According to the requirements of GB/T 16145-1995, the sample must be of the same mass density with standard source in the measurement of radiation activity with HPGe γ-ray spectrometer, but the density of the sample is hardly consistent with the standard source in laboratory. Purpose： The aim is to study the effect of the samples in different densities on measurement results. Methods： Firstly, the net count rates （n） of the six samples in various mass densities are measured using HPGe γ-ray spectrometer, and the respective self-absorption coefficients are calculated. Secondly, the sample-model is established using sourceless efficiency calibration software-Gammaclib. And then the detection efficiency and self-absorption coefficient are obtained. Results： The detection results show that with the raise of density, the self absorption coefficients are decreased. Conclusion： The results by both methods indicate that the differences of the density between sample and standard source have obvious influen
ISSN:0253-3219