CARR冷中子瞬发γ活化分析系统主要性能测试  

Performance Test of CARR based Cold Neutron Prompt Gamma Activation Analysis System

作　　者：运威旭 肖才锦[2] 姚永刚[2] 杨竣凯 石从 刘旭东 唐婵娟 倪邦发[2] 方方[1] YUN Wei-xu;XIAO Cai-jin;YAO Yong-gang;YANG Jun-kai;SHI Cong;LIU Xu-dong;TANG Chan-juan;NI Bang-fa;FANG Fang(Institute of Nuclear Technology and Automation,Chengdu University of Technology,Chengdu 610051,China;Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]成都理工大学核技术与自动化学院,成都610051 [2]中国原子能科学研究院核物理研究所,北京102413

出　　处：《核电子学与探测技术》2019年第4期393-399,共7页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(11475266);CARR基地工程建设(17ZYGC201401)资助

摘　　要：使用N型HPGe探测器第一次在中国先进研究堆上通过冷中子束流进行瞬发γ活化分析系统(PGNAA)测量技术研究。应用PGNAA测量系统对NH4CL、Eu、Au、In、Gd、Al、Fe等单质和化合物进行测量,得到实验测量灵敏度值,同时利用标准放射源152Eu、137Cs、60Co以及35Cl(n,γ)和157Gd(n,γ)瞬发γ源对探测器在宽能区0.1~8 MeV进行能量刻度和相对效率刻度,并利用金片活化法测量了中国先进研究堆运行功率为15 MW时有无冷源情况下的中子注量率,结果显示有冷源时中子注量率约提高一个数量级,最后论述了瞬发k0法,为定量实验做好准备。Cold neutron prompt gamma activation analysis system(CNPGAA)coupled with N-type high purity Germanium(HPGe)detector was firstly studied on China Advanced Research Reactor(CARR)at China Institute of Atomic Energy(CIAE).The prompt gamma spectra and corresponding sensitivity values of elements are obtained such as Eu,Au,In,Gd,Al,N,H and Cl,etc,.and the energy and relative efficiency calibrations of HPGe detector were carried out combining decay radioactive sources(152Eu,137Cs,and 60Co)and prompt gamma rays from 35Cl(n,γ)and 157Gd(n,γ)reactions in the wide energy region of 0.1~8.0 MeV.Besides,the neutron flux rates of CARR operated power of 15 MW with and without cold source were measured by the Au foil activation method.The results show that the neutron flux rate increases by an order of magnitude than which without cold source.Finally,the k0 method of prompt gamma rays based is discussed to prepare for quantitative experiments.

关 键 词：冷中子瞬发γ活化分析 灵敏度 能量和相对效率刻度 Au片活化法和瞬发k0法 

分 类 号：O657.4[理学—分析化学]