利用HPGe铀能谱143～1001 keV能区确定铀富集度的方法研究  

Research on Uranium Enrichment Determination Using 143-1 001 keV Region of HPGe Uranium Spectrum

作　　者：田园 刘国荣[1] 周浩[1] 赵永刚[1] 吕学升[1] 李井怀[1] TIAN Yuan;LIU Guorong;ZHOU Hao;ZHAO Yonggang;LYU Xuesheng;LI Jinghuai(China Institute of Atomic Energy,P.O.Box 275-8,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《原子能科学技术》2018年第3期515-520,共6页Atomic Energy Science and Technology

摘　　要：在核保障领域,铀富集度是一项重要核查指标。本文提出了一种通过分析235 U、238 U和228 Th(232 U的衰变子体)的特征γ能峰拟合相对探测效率曲线确定铀富集度的方法,编写了铀富集度分析程序。用HPGe探测器对两种化学形态、富集度范围为1.8%~90.2%的铀样品进行了重复性测量。结果显示,富集度的测量分析值与标称值的相对偏差小于3%。Uranium enrichment is recognized as a significant target of verification in nuclear safeguards.A method for uranium enrichment determination by analyzing gamma peaks of 235 U,238 U and 228 Th(daughter of 232 U)to calibrate relative detection efficiency was described.A code to verify the method by analyzing the spectrum was written.A HPGe detector was used to measure two types of uranium samples with enrichment ranging from 1.8%to 90.2%repeatedly.For the samples measured,the uranium enrichments are determined with an accuracy of about 3%.

关 键 词：核保障 铀富集度 HPGe铀能谱 相对探测效率曲线 自刻度 

分 类 号：O657.35[理学—分析化学]