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- W1968606411 abstract "A Monte Carlo simulation has been carried out to investigate the small pixel effect in highly pixellated X-ray imaging detectors fabricated from semi-insulating gallium arsenide. The presence of highly non-uniform weighting fields in detectors with a small pixel geometry causes the majority of the induced signal to be generated when the moving charges are close to the pixellated contacts. The response of GaAs X-ray imaging detectors is further complicated by the presence of charge trapping, particularly of electrons. In this work detectors are modelled with a pixel pitch of 40 and 150 μm, and with thicknesses of 300 and 500 μm. Pulses induced in devices with 40 μm pixels are due almost totally to the movement of the lightly-trapped holes and can exhibit significantly higher charge collection efficiencies than detectors with large electrodes, in which electron trapping is significant. Details of the charge collection efficiencies as a function of interaction depth in the detector and of the incident photon energy are presented." @default.
- W1968606411 created "2016-06-24" @default.
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- W1968606411 date "1999-09-01" @default.
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- W1968606411 title "Modelling of the small pixel effect in gallium arsenide X-ray imaging detectors" @default.
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- W1968606411 doi "https://doi.org/10.1016/s0168-9002(99)00739-1" @default.
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