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Prototype of an array SiPM-based scintillator compton camera for radioactive materials detection

Radiation Detection Technology and Methods 2019年第3期3卷 1-12页

作者： Ji‑Peng Zhang Xiu‑zuo Liang Jia‑le Cai Yi Liu Xian‑chao Huang Dao‑wu Li Xiong Xiao Xiao‑yu Pang Zhi‑ming Zhang Long Wei Lei Shuai Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

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.

关键词： compton imaging scintillator compton camera Silicon photomultipliers Image reconstruction

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