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This article presents a technique to improve the lateral position resolution of pixelated 3-D position sensitive, semiconductor detectors. Improvements in lateral position resolution allow for more precise Compton-imaging calculations, detector-response calibrations, and interaction-based corrections resulting in better spectroscopic and imaging performance. In pixelated detectors, the lateral position...
Mercuric iodide single crystals have been used successfully as gamma radiation detectors for many years. Recently a different growth method called `seeded homoepitaxy' has been studied. This method has the advantage of growing detector-sized volumes with a thickness of about 10mm in a highly accelerated timeframe. The electronic transport properties of a mercuric iodide detector have been shown to...
An experiment to measure the performance of 3-D position-sensitive pixellated HgI2 crystals cooled below room temperature was carried out using a new ASIC from GammaMedica-Ideas. This ASIC is capable of reading out the digitized pre-amplifier signal waveforms of 121 pixels and the cathode. A significant improvement in energy resolution from 1.48% FWHM at 662keV for the whole detector to 1.09% FWHM...
This work investigate the full energy and total efficiencies of large volume CdZnTe detectors. The efficiencies of three 20 mm × 20 mm × 15 mm pixelated CdZnTPe detectors were measured using the H3Dv2 Application Specific Integrated Circuit (ASIC) readout system developed by Brookhaven National Laboratory with un-collimated 241Am, 137Cs, and 60Co sources. One detector was made by eV-Products while...
Due to the steering grid that aids the collection of electrons by the anode pixels, the common-grid pixelated CdZnTe (CZT) detectors have demonstrated better performance than simple pixel detectors. For a detailed analysis of charge sharing and weighting potential cross-talk that occurs near and underneath the gap and energy resolution degradation in common-grid CZT detectors, a detailed detector...
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