CeBr_(3)探测器能量响应补偿的蒙特卡罗模拟研究  

A Monte Carlo Simulation Research of Energy Response Compensation for CeBr_(3)Detector

作　　者：杨集 刘秋实 李玉春 刘定夺 陶俊杰 YANG Ji;LIU Qiu-shi;LI Yu-chun;LIU Ding-duo;TAO Jun-jie(Strategic Technology Equipment Development Center,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院战略技术装备发展中心,绵阳621900

出　　处：《核电子学与探测技术》2025年第2期189-194,共6页Nuclear Electronics & Detection Technology

摘　　要：利用CeBr_(3)探测器测量空气比释动能时,为解决探测器在一定能量区间范围内能量响应具有较大能量差异问题,使仪器能量响应系数偏差达到标准要求。采用硬件补偿法对CeBr_(3)探测器探头进行能量响应补偿,使用MCNP5程序,模拟尺寸为Φ40 mm×40 mm的CeBr_(3)晶体在不同补偿模型下的能量响应,比较不同模型下相对能量响应偏差,选取最佳补偿模型。分析模拟结果,在补偿层厚度为6 mm,开孔比例为50%的补偿结构下,探测器的能量响应有极大改善。探测器在60 keV~1.5 MeV能量范围内的能量响应相对于0.662MeVγ射线能量响应偏差为-15%~18%,能够满足标准要求。In the measurement of air kerma with CeBr_(3) detectors,in order to solve the problem that the energy response of the detector has a large energy difference in a certain energy range,the deviation of the energy response coefficient of the instrument meets the standard requirements.The energy response of CeBr_(3) detector probe is compensated by hardware compensation method.The energy response of CeBr_(3) crystal with size ofΦ40mm×40mm under different compensation models is simulated by MCNP5 program.The relative energy response deviation under different models is compared,and the best compensation model is selected.The simulation results show that the energy response of the detector is greatly improved under the compensation structure with the thickness of the compensation layer of 6mm and the opening ratio of 50%.In the energy range of 60 keV~1.5 MeV,the deviation of the energy response coefficient of the detector relative to the energy response coefficient of 0.662 MeVγ-ray is-15%~18%,which can meet the standard requirements.

关 键 词：CeBr_(3)探测器 能量响应 蒙特卡罗模拟 能量响应补偿 MCNP5 

分 类 号：TL812.1[核科学技术—核技术及应用]