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Chinese Physics C> 2002, Vol. 26> Issue(12) : 1291-1296 

Monte Carlo Simulations for Optimum Design of Composite Detectors for High Energy γ Ray

  •  Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Nuclear Medicine School, Soochow University, Suzhou 215007, China

  • The efficiencies of clover and cluster composite detectors using NaI and BGO crystals as the media for detection of high energy γ ray are systematically simulated with Monte Carlo method. It is shown that for the same geometry of detection media concerned the efficiency of the composite BGO detector is much higher than that of the composite NaI detector. Therefore NaI crystal is not a suitable medium of composite detectors for high energy γ ray duo to low efficiency, Doppler broadening and distortion to γ spectrum in comparison with BGO crystal. The composite BGO detectors have many advantages such as large photopeak efficiency, small Doppler effect and regular γ spectrum. As to the clover and cluster composite detectors consisting of the cylinders of BGO crystal with original size 76×127, the intrinsic photopeak efficiencies are over 40% and the enhanced factor of absolute efficiencies is as high as 2.4 and 2.7, respectively, for 22 MeV γ ray.
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  • References

    [1] . Duchene G ,Beck F A ,Twin P J et al.Nucl.Instr.Meth.,1999,A432:90—110 2. Million B ,Bracco A ,Camera F et al.Nucl.Instr.Meth.,2000,A452:422—430 3. Shepherd S L ,Nolan P J,Cullen D M et al.Nucl.Instr.Meth.,1999,A434:73—3864. Maj A ,Gaardhoje J J,Atac A et al.Nucl.Phys.,1994,A571:185—220 5. Bruce A M ,Gaardhoje J,Herskind B et al.Phys.Lett.,1988,B215:237—2416. WEN WanXin,JIN GenMing.High Ener.Phys.and Nucl.Phys.,2002,26:1178(in Chinese)(文万信,靳根明.高能物理与核物理,2002,26:1178)7. Csatlos M ,Krasznahorkay A ,Bacelar J C S et al.Nucl.Instr.Meth.,1999,A421:272—2778. Brun R ,Carminati F .GEANT Detector Description and Simulation Tool,CERN Program Library,Long Writeup W5013ed.,CERN ,Geneva,19949. WEN WanXin,JIN GenMing,WANG SuFang.Nucl.Phys.Rev.,1999,16:237—242(in Chinese)(文万信,靳根明,王素芳.原子核物理评论,1999,16:237—242)

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WEN Wan-Xin and JIN Gen-Ming. Monte Carlo Simulations for Optimum Design of Composite Detectors for High Energy γ Ray[J]. Chinese Physics C, 2002, 26(12): 1291-1296.
WEN Wan-Xin and JIN Gen-Ming. Monte Carlo Simulations for Optimum Design of Composite Detectors for High Energy γ Ray[J]. Chinese Physics C, 2002, 26(12): 1291-1296. shu
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Received: 2001-12-29
Revised: 1900-01-01
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Monte Carlo Simulations for Optimum Design of Composite Detectors for High Energy γ Ray

    Corresponding author: WEN Wan-Xin,
  • Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Nuclear Medicine School, Soochow University, Suzhou 215007, China
  • Received Date: 2001-12-29
  • Accepted Date: 1900-01-01
  • Available Online: 2002-12-05

Abstract: The efficiencies of clover and cluster composite detectors using NaI and BGO crystals as the media for detection of high energy γ ray are systematically simulated with Monte Carlo method. It is shown that for the same geometry of detection media concerned the efficiency of the composite BGO detector is much higher than that of the composite NaI detector. Therefore NaI crystal is not a suitable medium of composite detectors for high energy γ ray duo to low efficiency, Doppler broadening and distortion to γ spectrum in comparison with BGO crystal. The composite BGO detectors have many advantages such as large photopeak efficiency, small Doppler effect and regular γ spectrum. As to the clover and cluster composite detectors consisting of the cylinders of BGO crystal with original size 76×127, the intrinsic photopeak efficiencies are over 40% and the enhanced factor of absolute efficiencies is as high as 2.4 and 2.7, respectively, for 22 MeV γ ray.

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