Geant4 analysis and optimization of a double crystal phoswich detector for beta–gamma coincidence detection  

作　　者：Xing Fan Xian-Peng Zhang Geng Tian Chao-Wen Yang 

机构地区：[1]Department of Nuclear Engineering and Technology, College of Physics Science and Technology, Sichuan University,Chengdu 610064, China [2]Key Laboratory of Radiation Physics and Technology,Ministry of Education, Sichuan University, Chengdu 610064,China [3]Northwest Institute of Nuclear Technology, Xi’an 710024,China

出　　处：《Nuclear Science and Techniques》2018年第4期92-97,共6页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.11205108,11475121,and 11575145);the Excellent Youth Fund of Sichuan University(No.2016SCU04A13)

摘　　要：In this study, a novel phoswich detector for beta–gamma coincidence detection is designed. Unlike the triple crystal phoswich detector designed by researchers at the University of Missouri, Columbia, this phoswich detector is of the semi-well type, so it has a higher detection efficiency. The detector consists of BC-400 and NaI:Tl with decay time constants of 2.4 and 230 ns, respectively.The BC-400 scintillator detects beta particles, and the Na I:Tl cell is used for gamma detection. Geant4 simulations of this phoswich detector find that a 2-mm-thick BC-400 scintillator can absorb nearly all of the beta particles whose energies are below 700 keV. Further, for a 2.00-cmthick NaI:Tl crystal, the gamma source peak efficiency for photons ranges from a maximum of nearly 90% at 30 keV to 10% at 1 MeV. The self-absorption effect is also discussed in this paper in order to determine the carrier gas' s influence.In this study, a novel phoswich detector for beta–gamma coincidence detection is designed. Unlike the triple crystal phoswich detector designed by researchers at the University of Missouri, Columbia, this phoswich detector is of the semi-well type, so it has a higher detection efficiency. The detector consists of BC-400 and NaI:Tl with decay time constants of 2.4 and 230 ns, respectively.The BC-400 scintillator detects beta particles, and the Na I:Tl cell is used for gamma detection. Geant4 simulations of this phoswich detector find that a 2-mm-thick BC-400 scintillator can absorb nearly all of the beta particles whose energies are below 700 keV. Further, for a 2.00-cmthick NaI:Tl crystal, the gamma source peak efficiency for photons ranges from a maximum of nearly 90% at 30 keV to 10% at 1 MeV. The self-absorption effect is also discussed in this paper in order to determine the carrier gas' s influence.

关 键 词：GEANT4 PHOSWICH detector Beta–gamma COINCIDENCE DETECTION DETECTION efficiency 

分 类 号：TL751[核科学技术—辐射防护及环境保护]