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Chinese Physics C> 2002, Vol. 26> Issue(11) : 1178-1183 

Numerical Simulations on Efficiency and Measurement of Capabilities of BGO Detectors for High Energy γ Ray

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

  • The energy resolution and time resolution of two φ75×100 BGO (bithmus germanate) detectors for high energy γ ray newly made were measured with 137Cs and 60Co resources. The two characteristic γ rays of high energy emitted from the thermal neutron capture of germanium in BGO crystal were used for the energy calibration of γ spectra. The intrinsic photopeak efficiency, single escape probability and double escape probabilities of BGO detectors in photon energy range of 4-30MeV are numerically calculated with GEANT code. The real count response and count ratio of the uniformly distributed incident photons in energy range of 0-30MeV are also calculated. The distortion of γ spectra caused by the photon energy loss extension to lower energy in detection medium is discussed.
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    [1] . Maj A ,Gaardhoje J,Atac A et al.Nucl.Phys.,1994,A571:185—2202. Bruce A M ,Gaardhoje J,Herskind B et al.Phys.Lett.,1988,B215:237—241 3. Csatlos M ,Krasznahorkay A ,Bacelar JCS et al.Nucl.Instr.Meth.,1999,A421:272—2774. Krolas W ,Maj A ,BednarczykPetal.Z .Phys.,1992,344:145—147 5. Nelson W R ,Hirayama H ,Rogers D .The EGS4 code,SLAC 265,1985 6. Brun R ,Carminati F .GEANTD etector Description and Simulation Tool,CERN Program Library,Long Writeup W5013ed,CERN ,Geneva,19947. LIU Xin,YE Yan-Lin,JIANG Dong-Xing et al.High Ener.Phys.and Nucl.Phys.,1994,18:496—502(in Chinese) (刘昕,叶沿林,江栋兴等.高能物理与核物理,1994,18:496—502) 8. YE Yan-Lin.Chin.J.Comp.Phys.,1994,11:(3)379—383(in Chinese) (叶沿林.计算物理,1994,11:(3)379—383)

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WEN Wan-Xin and JIN Gen-Ming. Numerical Simulations on Efficiency and Measurement of Capabilities of BGO Detectors for High Energy γ Ray[J]. Chinese Physics C, 2002, 26(11): 1178-1183.
WEN Wan-Xin and JIN Gen-Ming. Numerical Simulations on Efficiency and Measurement of Capabilities of BGO Detectors for High Energy γ Ray[J]. Chinese Physics C, 2002, 26(11): 1178-1183. shu
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Received: 2001-12-29
Revised: 1900-01-01
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Numerical Simulations on Efficiency and Measurement of Capabilities of BGO Detectors for High Energy γ Ray

    Corresponding author: WEN Wan-Xin,
  • Institute of Modern Physics, CAS, Lanzhou 730000, China2 Nuclear Medicine School Soochow University, Suzhou 215007, China
  • Received Date: 2001-12-29
  • Accepted Date: 1900-01-01
  • Available Online: 2002-11-05

Abstract: The energy resolution and time resolution of two φ75×100 BGO (bithmus germanate) detectors for high energy γ ray newly made were measured with 137Cs and 60Co resources. The two characteristic γ rays of high energy emitted from the thermal neutron capture of germanium in BGO crystal were used for the energy calibration of γ spectra. The intrinsic photopeak efficiency, single escape probability and double escape probabilities of BGO detectors in photon energy range of 4-30MeV are numerically calculated with GEANT code. The real count response and count ratio of the uniformly distributed incident photons in energy range of 0-30MeV are also calculated. The distortion of γ spectra caused by the photon energy loss extension to lower energy in detection medium is discussed.

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