Abstract
CZT detectors have attracted much interest as room-temperature solid-state X-ray and gamma ray detectors due to their high energy resolution and high spatial resolution. Pixel CZT detectors are widely applied. However, the observed spectrum of a single pixel is distorted towards lower energies. The possible reasons for the spectral distortion may be carriers trapping, charge sharing with the adjacent pixels, and scattering photons contributed by the other pixels. To find out the cause, Monte Carlo simulation codes were developed to get an insight of the reason for the spectral distortion. Simulation and measurement confirmed that the reason for high counts below 150 keV are not backscatter, but charge sharing. Another remarkable conclusion was that the low tail of full energy peak is mainly due to charge sharing rather than electron trapping. Measurements also showed anti-coincident readout is effective to mitigate the spectral distortion.
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