基于缓发γ能谱测量的铀丰度分析  

Uranium Abundance Analysis Based on Delayed Gamma-ray Spectra Measurement

作　　者：田晨杨 张立波 时超 王健 曹亭 TIAN Chenyang;ZHANG Libo;SHI Chao;WANG Jian;CAO Ting(Troops No.96607,Baoji 721000,Shaanxi)

机构地区：[1]96607部队,陕西宝鸡721000

出　　处：《火箭军工程大学学报》2020年第3期42-49,共8页Journal of Rocket Force University of Engineering

摘　　要：为了验证构建的缓发γ能谱理论计算公式和计算程序,根据主动探测原理进行实验测量.测量时采用加速器驱动的脉冲中子源照射铀材料,利用HPGe探测器得到缓发γ实验谱,并与缓发γ计算谱进行了比较.最后,根据以上结果选择^(94)y的0.92 MeV γ峰、^(89)Rb的1.248 MeV γ峰、^(138)Cs的1.436 MeV γ峰为特征峰,分析了特征峰计数与铀丰度的关系.结果 显示:缓发γ能谱峰计数的实验与计算值相对偏差为2.72%~9.7%,表明理论公式和计算程序是可靠的;^(94)y、^(89)Rb和^(138)Cs的特征峰计数随^(235)U丰度增大而增大,该方法可用于样品的235U丰度分析.As the delayed γ-ray spectra is a product of uranium fission,it is proposed to analyze uranium abundance by measurement delayed γ-ray spectra.To validate the proposed delayed γ-ray spectra theoretical calculation formula and procedure,experimental measurements were conducted according to the active detection principle.The uranium material was firstly irradiated by an accelerator-driven pulsed neutron source.Consequently,the experimental spectrum of delayed γ-ray spectra was obtained by HPGe detector.Furthermore,the experimental spectrum was compared with the spectrum generated by the theoretical calculation.Finally,the relationship between counts of characteristic peaks and uranium abundance was analyzed by taking the 0.92 MeV γ peak of ^(94)Y,1.248 MeV γ peak of^(89)Rb,and 1.436 MeV γ peak of ^(138)Cs as characteristic peaks.Results showed that the relative deviation of the experimental and calculated values of the delayed γ-ray spectra peak counts ranges from 2.72%to 9.7%,indicating the reliability of the theoretical calculation formula and procedure.Moreover,the characteristic peak counts of ^(94)Y,^(89)Rb and ^(138)Cs increased with the increase of ^(235)U abundance.It is feasible to analyze the uranium abundance by the proposed method.

关 键 词：缓发γ能谱 铀 丰度 

分 类 号：O57[理学—粒子物理与原子核物理]