利用HPGe铀能谱88~100 keV能区确定铀富集度方法研究

Research on Uranium Enrichment Determination Using 88-100 keV Region of HPGe Uranium Spectrum

摘要: 利用铀材料γ能谱88～100 keV能区中γ、X射线重峰分解确定同位素丰度的方法，是铀同位素分析商用软件MGAU、MGA++等的核心技术。本文建立了γ、X射线峰形模型，提出了效率拟合因子修正效率的方法，并自行编写了铀富集度分析程序。用HPGe γ谱仪对两种化学形态、铀富集度范围为1.80%～90.1%的铀样品进行了测量，以验证自编程序的可行性。利用本文所编写的程序分析实验能谱，得到的芯块样品分析结果与标称值的相对偏差小于2%，粉末样品分析结果与标称值的相对偏差小于1%。

Abstract: The method which is used to determine uranium enrichment by deconvoluting complex peak clusters in 88-100 keV region of γ/X spectrum of uranium materials is the key technique of some uranium enrichment determination software, such as MGAU, MGA ++, etc. According to the basic principle of this method, a code to analyze the spectrum was written, in which peak shape model of γ/X ray was built to fit the spectrum and efficiency fitting factor was developed to make efficiency correction. Two types of uranium samples with enrichment ranging from 1.80% to 90.1% were measured by a HPGe detector and analyzed by the code. For the samples measured, the uranium enrichment was determined with relative deviation of about 2% for pellet and 1% for powder samples.