Compact MPPC-based coded aperture imaging camera for dual-particle detection

作     者：Jing Guo Xiaoyu Pang Jiale Cai Daowu Li Xiaoming Wang Xuanhou Hu Yue Yu Shuangquan Liu Xiuzuo Liang Yiwen Zhang Lei Shuai Long Wei 

作者机构：Beijing Engineering Research Center of Radiographic Techniques and EquipmentInstitute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China Jinan Laboratory of Applied Nuclear ScienceJinan 250131China 

出 版 物：《Radiation Detection Technology and Methods》 (辐射探测技术与方法（英文）)

年 卷 期：2021年第5卷第1期

页      面：61-70页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：the MajorDeployment Projects of Chinese Academy of Sciences(Grant Number ZDRWCN-2018-1-01) the Research Equipment Development Project of Chinese Academy of Sciences(Grant Number YZ201415) 

主　　题：Coded aperture imaging Fast neutron imaging Gamma imaging n-γdiscrimination 

摘      要：Purpose Fast neutrons and gamma-ray imaging detection is an effective way to detect and identify radioactive material in the field of nuclear security.A compact coded aperture imaging(CAI)camera was designed to be sensitive to both gamma and neutron radiation based on plastic scintillators and multi-pixel photon counters(MPPC).Methods MPPCs coupling with the 13×13 pixelated plastic scintillators one-to-one were utilized to reduce the scale of the CAI system while maintaining good positional *** symmetric charge division(SCD)circuit was adopted to reduce the 169 signals output from the MPPC array to *** waveform was collected and processed with four Domino Ring Sampler 4(DRS4)chips and two 16-channel analog-to-digital converter(ADC)*** the pulse shapes of fast neutrons would be broadened after elastic scattering multiple times in the scintillators,the Anger-Logic method was applied to eliminate multiple elastic scattering events so that good pulse shape discrimination(PSD)performance can be *** The imaging and detection ability of the camerawas evaluated using the 241Am-Be(5.9×10^(5) n/s)neutron source and 137Cs(370 MBq)*** camera can be used to detect fast neutrons(0.5–10 MeV)and gammarays(0.2–2.5MeV).Furthermore,it can implement efficient neutron/gamma PSD capabilities in the mixed-field *** figure of merit(FOM)of the camera calculated at 400keVee energy cut is *** A compact MPPC-based CAI camera was designed to detect and discriminate fast neutrons and gamma *** good PSD performance was well suited to distinguish fast neutrons from gamma rays in a dual-particle *** portable design makes it promising for complex monitoring scenarios in nuclear security.