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

WEN Wan-Xin; JIN Gen-Ming

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

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

WEN Wan-Xin ^, ,
JIN Gen-Ming

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

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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.

References

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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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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

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