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Journal of Shanghai University（Natural Science Edition） ›› 2016, Vol. 22 ›› Issue (2): 231-237.doi: 10.3969/j.issn.1007-2861.2016.01.004

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Influence of charge collection efficiency on energy spectrum for planar CdZnTe detector

LI Yang1, LUO Wenyun1, JIA Xiaobin1, ZHANG Jialei1, WANG Linjun2   

  1. 1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;
    2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
  • Received:2016-01-16 Online:2016-04-30 Published:2016-04-30

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Abstract:

Using Monte-Carlo code Geant4 to model the planar CdZnTe detector, the incidences of two different energy ray 241Am (59.5 keV) and 137Cs (662 keV) to the planar CdZnTe detector from the cathode surface perpendicularly were simulated. The charge collection efficiency was calculated by adding the Hecht equation in Geant4. Combined with distributions of the deposited energy, electron-hole pairs and the interaction types, the influence of charge collection efficiency on the energy spectrum was discussed. The results showed that the energy spectrum shifted to the low energy side after considering the charge collection efficiency. The shift was closely connected to the maximum charge collection efficiency.

Key words: energy spectrum,  CdZnTe detector ,  charge collection efficiency ,  electron-hole pairs , Geant4