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Pixellated CdZnTe detectors have shown its potential to provide excellent spectroscopic performance at University of Michigan. To minimize charge loss in the gap between pixels, steering grid was used on standard Polaris CdZnTe detectors. Steering grid is biased and placed between pixels to force electrons to drift to anode pixels so that they won't be trapped in the gap. Such design is proven to...
Charge sharing and weighting potential cross-talk between pixels are important factors that degrade the energy resolution in multiple-pixel events. However, simulation studies indicate that these factors cannot fully explain the measured energy resolution degradation for multiple-pixel events nor the Compton image distortion observed in some detector systems. This work presents simulation-based analysis...
Large volume, pixelated Cadmium Zinc Telluride detectors have been developed over the past decade. In November of 2009, Redlen Technologies began manufacturing 130 20×20×15 mm3 CdZnTe detectors, each with a common grid between the 121 pixels, for the Polaris Project. Results for the first 65 detectors were studied to determine a set of criteria that could be used to help streamline the detector testing...
We describe an application specific integrated circuit (ASIC) for 3D position-sensitive detectors. It was optimized for pixelated CZT sensors, and it measures, corresponding to an ionizing event, the energy and timing of signals from 121 anodes and one cathode. Each channel provides low-noise charge amplification, high-order shaping, along with peak- and timing-detection. The cathode's timing can...
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