Simulation and calibration of the response function of multi-sphere neutron spectrometer  

作　　者：JIANG Xiaofei CHEN Chao CAO Jing CAO Hongrui LI Shiping SONG Xianying YIN Zejie 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China [2]Department of Modern Physics,University of Science and Technology of China [3]Southwestern Institute of Physics

出　　处：《Nuclear Science and Techniques》2013年第6期105-108,共4页核技术（英文）

基　　金：Supported by ITER Plan National Major Project 2008GB109000

摘　　要：In order to realize the on-line real-time measurement of neutron spectrum of ITER fusion,this paper presents a multi-sphere spectrometer system which consists of eight thermal neutron detectors,namely SP9 3He proportional counter,embedded in eight different diameter polyethylene spheres.The response function of eight polyethylene spheres of multi-sphere neutron spectrometer was calculated after the simulation of the neutron transport processes in multi-sphere spectrometer by adopting software Geant4.The peak of the response function is in the low energy region for smaller diameter polyethylene sphere.As the polyethylene sphere diameter increased,the peak of the response function moves to the high energy region.The experimental calibration adopts 241Am-Be neutron source.The relative error between normalized data of experiment 4πsolid angle counts and normalized data of simulated detection efficiency of 4in to 8in polyethylene sphere is from 1.152%to 12.222%.The experimental results verify the response function of the simulation.All these results provide a theoretical and experimental basis for solving the on-line real-time neutron spectrum of ITER fusion.In order to realize the on-line real-time measurement of neutron specmnn of ITER fusion, this paper presents a multi-sphere spectrometer system which consists of eight thermal neutron detectors, namely SP9 3He proportional counter, embedded in eight different diameter polyethylene spheres. The response function of eight polyethylene spheres of rnulti-sphere neutron spectrometer was calculated after the simulation of the neutron transport processes in multi-sphere spectrometer by adopting software Geant4. The peak of the response function is in the low energy region for smaller diameter polyethylene sphere. As the polyethylene sphere diameter increased, the peak of the response function moves to the high energy region. The experimental calibration adopts 241Am-Be neutron source. The relative error between normalized data of experiment 47t solid angle counts and normalized data of simulated detection efficiency of 4in to 8in polyethylene sphere is from 1.152% to 12.222%.The experimental results verify the response function of the simulation. All these results provide a theoretical and experimental basis for solving the on-line real-time neutron spectrum of ITER fusion.

关 键 词：响应函数 中子谱仪 仿真 在线实时测量 正比计数管 数据归一化 校准 GEANT4 

分 类 号：TL817.3[核科学技术—核技术及应用]