辐射防护 ›› 2022, Vol. 42 ›› Issue (4): 312-316.

• 辐射防护监测 • 上一篇    下一篇

γ能谱分析中土壤探测效率与密度相关性计算分析

刘庆云, 胡翔, 马国学, 冯月, 李立凡, 韩巧叶   

  1. 北京市核与辐射安全中心,北京 100089
  • 收稿日期:2021-09-02 出版日期:2022-07-20 发布日期:2022-08-15
  • 作者简介:刘庆云(1986—),女,2009年毕业于山东第一医科大学应用物理学专业(医学物理学方向),2012年毕业于南华大学辐射防护与环境保护专业,硕士,高级工程师。E-mail:liuqingyun204@163.com

Computational analysis on correlation between soil detection efficiency and soil density in γ energy spectrum analysis

LIU Qingyun, HU Xiang, MA Guoxue, FengYue, LI Lifan, HAN Qiaoye   

  1. Beijing Nuclear and Radiation Safety Center, Beijing 100089
  • Received:2021-09-02 Online:2022-07-20 Published:2022-08-15

摘要: γ能谱分析中不同能量探测效率的准确校准是影响测量结果准确度的重要因素。本文基于国产无源效率计算软件Gammacalib对几种不同密度的土壤样品建模,计算相应的探测效率,与标准源实验测量的探测效率比较,验证无源效率计算的准确性。根据无源效率计算结果,分析相应探测效率与土壤密度的相关性,得到ε~ρ回归方程。对于土壤标准源,有源效率与无源效率之间的相对偏差在-7.6%~8.1%之间,效率与密度呈正相关,相关系数在0.938~0.992之间。国产无源效率软件Gammacalib探测效率计算结果与标准源实验测量结果相对偏差可接受,可满足日常辐射环境实验室样品测量和核事故应急监测要求,ε~ρ回归方程的适用性良好,可为环境土壤样品的密度差异效率修正提供参考。

关键词: γ能谱分析, 探测效率, 相关性, 无源效率计算, 实验校准

Abstract: The accurate calibration of different energy detection efficiency in γ spectrum analysis is an important factor affecting the accuracy of measurement results. In this paper, based on domestic efficiency calibration software Gammacalib, soil samples with different densities were modeled to calculate the corresponding detection efficiency, and compared with the value measured by standard sources to verify the accuracy of Gammacalib. According to the calibration results of Gammacalib, the relative detection efficiency with soil density was analyzed, and the ε~ρ regression equation was obtained. Results for standard soil sources, the relative deviation between active efficiency and Gammacalib ranged from -7.6% to 8.1%, and efficiency was positively correlated with density, with the correlation coefficient between 0.938 and 0.992. The relative deviation of detection efficiency between the calculation results of Gammacalib and standard source can be acceptable. Gammacalib, the domestic efficiency calibration software, can meet the requirements of daily radiation environment monitoring and nuclear accident emergency monitoring, and the applicability of ε~ρ regression equation is good, which can provide reference for different density and efficiency correction.

Key words: γ spectrum analysis, detection efficiency, correlation, sourceless efficiency calculation, experimental calibration

中图分类号: 

  • TL817