HPGe γ谱仪点源探测效率计算的蒙特卡罗方法研究  

Research on Calculating The Point Source Detection Efficiency of HPGe Gamma Spectrometer by Monte Carlo Method

作　　者：李则书 梁珺成[2] 刘良军[1] 刘皓然[2] 张明[2] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]中国计量科学研究院,北京100013

出　　处：《核电子学与探测技术》2014年第9期1037-1040,共4页Nuclear Electronics & Detection Technology

摘　　要：在CT 扫描精确获得HPGe探测器结构尺寸的基础上，用MCNP4C蒙特卡罗程序建立了HPGeγ谱仪计算点源的物理模型；通过对探测器死层尺寸的精确校正，确定了探测器死层厚度为0．38 cm；以点源物理模型和探测器死层校正尺寸为基础，分别计算了60 Co、133 Ba、137 Cs、241 Am和152 Eu标准点源各能量分支的探测效率，并与实验结果比较，计算在59．54～1408．01 keV能量范围内探测效率的最大相对偏差为2．39％，最小相对偏差为0．13％。On the basis of accurate HPGe detector＇s size which is obtained by CT scanning , the calculation of point source physical model in HPGe gamma spectrometer is established by using MCNP 4C Monte Carlo code;By means of correcting the detector dead layer , the final dead layer thickness is identified as 0 .38 cm;Based on the point source physical model and the result of detector dead layer correction , detection efficiencies of each energy branch of 60 Co,133 Ba,137 Cs,241 Am and 152 Eu standard point sources are calculated by MCNP 4C, compa-ring with the experimental results , the maximun relative deviation in the 59.54-1 408.01 keV energy range is 2.39%, and the minimum is 0.13%.

关 键 词：探测效率 蒙卡方法 HPGE Γ谱仪 CT扫描 

分 类 号：TL84[核科学技术—核技术及应用]