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Investigation of the Imaging Polarization Effect Based on a Pixellated CdZnTe Detector |
LI Miao1, XIAO Sha-Li1, ZHANG Liu-Qiang1, CAO Yu-Lin2, CHEN Yu-Xiao2, SHEN Min1, WANG Xi1 |
| 1Key Laboratory of Optoelectronic Technology and System (Ministry of Education), Chongqing University, Chongqing 400030 2Institude of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900 |
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| Cite this article: |
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LI Miao, XIAO Sha-Li, ZHANG Liu-Qiang et al 2010 Chin. Phys. Lett. 27 070702 |
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Abstract A pixel array CdZnTe imaging system, employing a 40×40×5 mm3 pixellated CdZnTe detector, is established. The imaging polarization effect in the CdZnTe pixellated detector for a collimated Cs137 Gamma source is investigated in detail. The experimental results for different irradiated fluxes indicate that excessive irradiated flux indeed causes central pixels to be shut off completely. The imaging performance of the polarized detector is severely degraded. Polarized detector counts are simultaneously reduced to one-third of the non-polarized detector counts. A theoretical model of potential distribution is also proposed by solving the Poisson equation and, in turn, the electric potential distortion for high irradiated flux is discussed by comparison with the experimental results.
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| Keywords:
07.85.Fv
24.70.+s
72.20.Dp
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Received: 25 March 2010
Published: 28 June 2010
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| PACS: |
07.85.Fv
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(X- and γ-ray sources, mirrors, gratings, and detectors)
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24.70.+s
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(Polarization phenomena in reactions)
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72.20.Dp
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(General theory, scattering mechanisms)
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