利用新型CeBr_(3)探测器测量^(238)U活度研究  

Research about the activity measurement of ^(238)U using the new CeBr_(3) detector

作　　者：冯延强[1] 王铁健[1] 杨龙泉[1] 焦仓文[1] 李必红[1] 赵丹[1] 王海洋[1] FENG Yanqiang;WANG Tiejian;YANG Longquan;JIAO Cangwen;LI Bihong;ZHAO Dan;WANG Haiyang(Key Laboratory of Uranium Resource Exploration and Evaluation Technology of China National Nuclear Corporation,Beijing Research Institute of Nuclear Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院中核集团铀资源勘查与评价技术重点实验室,北京100029

出　　处：《核技术》2021年第3期34-39,共6页Nuclear Techniques

基　　金：中核集团青年英才(菁英)项目(No.QNYC2019-1);核能开发相山铀矿田科学钻探Ⅱ期(No.HXS1403)资助。

摘　　要：将新型高分辨率CeBr_(3)闪烁体探测器应用于天然样品中^(238)U活度测量,利用实测谱数据分析了该新型探测器通过1 001 keV(^(234m)Pa)能量峰测量^(238)U活度的可行性,并与高分辨率HPGe半导体探测器进行了样品的测量对比。结果表明:该新型探测器可将1 001 keV与969 keV(^(238)UAc)区分开来,利用1 001 keV分析样品中^(238)U结果与HPGe一致,可用于室温条件下天然样品中^(238)U活度测量。[Background]At present,the determination of ^(238)U activity in natural samples mainly relies on HPGe spectrometer,but it has application limitation and high cost.[Purpose]This study aims to measure the activity of ^(238)U by the new detector at room temperature,providing a lower cost,more convenient and efficient technical means for on-site activity measurement and natural sample analysis.[Methods]The original spectrum data of natural samples measured by the new CeBr_(3) detector were analyzed.The feasibility of extracting energy peak of 1001 keV for ^(238)U content calculation from the measured U-Ra gamma spectrum was investigated.Influence of 1001 keV and 969 keV peeks and calculation of the peak area were explored by using the measured U-Th gamma spectrum.Finally,the measurement results of 1001 keV energy peek obtained by using CeBr_(3) detector were compared with those of high resolution HPGe semiconductor detector to evaluate the effectiveness of this method.[Results]The comparison results show that the CeBr_(3) detector can be used to distinguish 1001 keV(^(238)U)energy peek from 969 keV(228Ac)energy peek in the measured spectrum of natural samples,and the activity measurement result of ^(238)U using 1001 keV energy peek is consistent with HPGe spectrometer.[Conclusions]The new CeBr_(3) detector is applicable to measuring the activity of ^(238)U in natural samples at room temperature.

关 键 词：CeBr_3探测器 ^(238)U 1001 keV 活度测量 

分 类 号：O615.13[理学—无机化学]