Abstract
Two three-dimensional position sensitive CdZnTe gamma-ray spectrometers based on VAS2/TAT2 ASICs were constructed and fully tested. Each 1.5/spl times/1.5/spl times/1 cm/sup 3/ CdZnTe detector employs 11/spl times/11 pixelated anodes. Each pixel location provides the interaction's lateral coordinates, while the cathode/anode signal ratio and the electron drift time are both used to obtain the interaction depth. Data-acquisition and processing software were developed to perform calibration and real-time spectroscopy. An energy resolution of 1.11% full-width at half-maximum (FWHM) at 662 keV was obtained for single-pixel events from the 120 working pixels of one detector, and an energy resolution of 1.14% FWHM was obtained on the other detector. Significant progress in improving energy resolution for multiple pixel events has been realized. The energy resolutions at 662 keV for two-pixel events and three-pixel events were 1.57% FWHM and 2.13% FWHM, respectively.
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