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Study on Compton-suppressed Phoswich Gamma-ray Detector of LaBr3(Ce)-CsI(Tl)
Tianxiao LI, Hongyi WU, Yun ZHENG, Congbo LI, Lihua ZHU, Xiaoguang WU, Jingbin LU, Min ZHENG, Zihao ZHAO, Ruofu CHEN, Jiande WEI
2023, 40(1): 73-77. doi: 10.11804/NuclPhysRev.40.2022021  Published:2023-03-20
Keywords: phoswich gamma-ray detector, LaBr3(Ce), CsI(Tl), pulse shape identification, Monte Carlo simulation
In this work, a compact phoswich detector consisting of a cylindrical LaBr3(Ce) principal crystal and a well-shaped CsI(Tl) sub-crystal was designed and assembled to identify and reject Compton scattering in the LaBr3(Ce). Two different crystals coupled to the same photomultiplier tube (PMT). The energy deposition in each layer from incident radiation is then determined via digital pulse shape analysis of the PMT’s pulses. The results of Geant4 simulations were used to verify the performance of the pulse shape identification and the effect of Compton background suppression. Experimental tests were conducted on the detector prototype using a 60Co gamma source, and the result shown that the detector background suppression coefficient was 2.33(1) which achieved the expected purpose of twice as much as the Compton background was suppressed.