常见γ能谱探测器的核谱学性能测量与对比分析  

Nuclear spectrometric performance measurement and comparative analysis of common gamma spectrum detectors

作　　者：孙海 顾先宝 於国兵 王浩 闻德运 张文亮 刘犇 SUN Hai;GU Xianbao;YU Guobing;WANG Hao;WEN Deyun;ZHANG Wenliang;LIU Ben(Anhui Radiation and Environment Supervision Station,Hefei 230071,China)

机构地区：[1]安徽省辐射环境监督站,合肥230071

出　　处：《辐射研究与辐射工艺学报》2025年第2期127-134,共8页Journal of Radiation Research and Radiation Processing

摘　　要：为了解不同γ能谱探测器的核谱学性能,选择了HPGe、CZT、LaBr_(3)(Ce)、CeBr_(3)和NaI(Tl)常见γ能谱探测器,分别测量了241Am、137Cs和60Co标准源,计算了不同探测器对不同核素的探测限。结果表明:在环境本底条件下,HPGe、CZT、LaBr_(3)(Ce)、CeBr_(3)和NaI(Tl)γ能谱探测器对发射低能γ射线241Am的探测限分别是0.039 Bq、0.180 Bq、0.781 Bq、0.697 Bq和1.104 Bq,但是在铅室内测量样品中137Cs的活度时,探测限分别是0.005 Bq、0.294 Bq、0.036 Bq、0.037 Bq和0.057 Bq。测量和计算结果展示了不同探测器的γ射线全能峰形、源峰探测效率、本底能谱和不同应用场景下的探测限,为选择合适的γ能谱探测器测量样品活度提供了可供参考的核谱学性能参数。To understand the nuclear spectroscopic performance of gamma-ray spectrum detectors in different application scenarios,HPGe,CZT,LaBr_(3)(Ce),CeBr_(3),and NaI(Tl),which are common gamma-ray spectrum detectors,were selected.241Am,137Cs,and 60Co standard sources were measured,and the detection limits of the different detectors for different nuclides were calculated.The results show that under environmental background conditions,the detection limits of the HPGe,CZT,LaBr_(3)(Ce),CeBr_(3),and NaI(Tl)gamma spectrum detectors for lowenergy gamma-ray 241Am are 0.039 Bq,0.180 Bq,0.781 Bq,0.697 Bq,and 1.104 Bq,respectively.However,when measuring the activity of 137Cs in the lead chamber,the detection limits are 0.005 Bq,0.294 Bq,0.036 Bq,0.037 Bq,and 0.057 Bq,respectively.The measurement and calculation results show the full-energy peak shape,source peak detection efficiency,background energy spectrum,and the detection limits of the different detectors in different application scenarios,thus providing reference nuclear spectroscopic performance parameters for selecting the appropriate gamma spectrum detectors to measure sample activity.

关 键 词：γ 射线全能峰形 源峰探测效率 本底能谱 探测限 γ 能谱探测器 

分 类 号：TL816.4[核科学技术—核技术及应用]