Prototype of an array SiPM-based scintillator Compton camera for radioactive materials detection
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
出 版 物：《Radiation Detection Technology and Methods》 (辐射探测技术与方法（英文）)
年 卷 期：2019年第3卷第3期
页 面：1-12页
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 Instrument Developing Project of the Chinese Academy of Sciences Grant(No.29201707) the Key Research Program of Chinese Academy of Science Grant(ZDRW-CN-2018-101)
主 题：Compton imaging Scintillator Compton camera Silicon photomultipliers Image reconstruction
摘 要：Purpose The Compton camera,which visualizes the distribution of gamma-ray sources based on the kinematics of Compton scattering,has advantage of wide field of view,broad range of energy and compact *** In this study,we proposed a prototype of Compton camera,which included array silicon photomultiplier(SiPM)-based position-sensitive detectors,data acquisition(DAQ)system and image reconstruction *** detectors were composed of Ce-doped Gd_(3)Al_(2)Ga_(3)O_(12) scintillator arrays and pixel Si-PM *** DAQ system,symmetric charge division circuit,impedance bridge circuit and the delay coincidence algorithm were designed to record coincidence *** back-projection algorithm and list-mode maximum likelihood expectation maximization algorithm were adopted for image *** coordinate of longitude and latitude was used for image *** The performance of this Compton camera prototype system was *** results indicated that this system was able to locate a ^(137)Cs point source within 20 s with the corresponding radiation dose of~1.0μSv/*** angular resolution of point source was~7°(FWHM),and the total energy resolution of 662 keV was 7.2%.Furthermore,we succeeded in separating two point sources of different energy[^(22)Na(511 keV),^(137)Cs(662 keV)]in laboratory *** This prototype of scintillator Compton camera offers capabilities for applications like source term investigation and radioactive materials detection.
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