MC模拟HPGe探测器测量^(222)Rn子体探测效率  

The Measurement of Detection Efficiency of Radon Progeny Using HPGe Detector by MC Simulation

作　　者：李艺 赵桂芝[1] 宋时雨 LI Yi;ZHAO Gui-zhi;SONG Shi-yu(Institute of Nuclear Science and Technology of University of South China,Hengyang,Hunan 421001,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001

出　　处：《核电子学与探测技术》2020年第2期210-215,共6页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金项目(11975120)资助。

摘　　要：补充了Pylon RN-190氢子体标准源的累积系数,利用该装置制作氡子体γ标准源对HPGe探测器γ探测效率进行刻度,并通过^(137)Cs、^(60)Co点源修正了HPGe探测器的死层厚度及冷指高度,同时用MCNP模拟该谱仪对^(222)Rn子体圆面源的探测效率。模拟与实验结果表明:Pylon氡子体标准源同样适用于HPGe探测器探测效率的刻度;在RaB的特征能量点上,用MCNP模拟取样滤膜上的^(222)Rn子体源的探测效率,与实测值的相对误差可控制在5%以内。We supplemented the cumulative coefficient of the standard source of the Pylon RN-190 radon progeny,and used the device to make the gamma standard source to calibrate the gamma detection efficiency of HPGe detector.The dead layer thickness and cold finger height of HPGe detector were modified by ^(137)Cs and ^(60)Co point source,and the detection efficiency of the spectrometer on ^(222)Rn daughter circular surface source was simulated by MCNP.The simulation and experimental results show that the standard source of Pylon radon progeny is also applicable to the calibration efficiency of HPGe detectors.At the characteristic energy point of R aB,the relative error between the MCNP analog value and the measured value of the detection efficiency of the ^(222)Rn daughter on the sampling filter can be controlled within 5%.

关 键 词：HPGE探测器 γ探测效率 氡子体标准源 MCNP 

分 类 号：TL82[核科学技术—核技术及应用]