Effects of food sample density on detecting results of HPGe γ-spectrometer

WAN Yongliang; TIE Lieke; ZHU Xia; LIU Mohan; LIU Jinhao

doi:10.11889/j.0253-3219.2014.hjs.37.010205

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Effects of food sample density on detecting results of HPGe γ-spectrometer

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- Effects of food sample density on detecting results of HPGe γ-spectrometer
- NUCLEAR TECHNIQUES Vol. 37, Issue 1, Article number: 010205(2014)
- 作者机构：
  
  1. 新疆出入境检验检疫局检验检疫技术中心,乌鲁木齐,830063
  2. 新疆大学物理科学与技术学院,乌鲁木齐,830046
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.010205
  CLC：
- Published：20 January 2014
- 稿件说明：
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WAN Yongliang, TIE Lieke, ZHU Xia, et al. Effects of food sample density on detecting results of HPGe γ-spectrometer[J]. Nuclear techniques, 2014, 37(1): 010205
DOI：

WAN Yongliang, TIE Lieke, ZHU Xia, et al. Effects of food sample density on detecting results of HPGe γ-spectrometer[J]. Nuclear techniques, 2014, 37(1): 010205 DOI： 10.11889/j.0253-3219.2014.hjs.37.010205.

摘要

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232Th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自吸收校正系数。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。

Abstract

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 influences on the measurement results and need self-absorption correction.Cited

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