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—Three-dimensional (3-D) position-sensitive CdZnTe (CZT) gamma-ray spectrometers employing new VAS3.1/TAT3 ASIC readouts were developed and tested. Each spectrometer is a 1 5 1 5 1 cm 3 CdZnTe crystal with 11 11 pixellated anodes wire-bonded to the readout electronics using an intermediate ceramic substrate with plated-through-via. The signals from the(More)
A 3D CdZnTe detector can provide 3D position information as well as energy information of each individual interaction when a gamma ray is scattered or absorbed in the detector. This unique feature provides the 3D CdZnTe detector the capability to do Compton imaging with a single detector. After detector calibration, real-time data acquisition and imaging(More)
of 11 by 11 pixellated anodes and a planar cathode. The energy depositions and 3-dimensional positions of individual interactions of each incident gamma ray can be obtained from pulse amplitude , location of each pixel anode and the drift time of electrons. Ten detectors were tested individually and half of them achieved resolution of 1 0% FWHM at 662 keV(More)
A simple, rapid and sensitive high-performance liquid chromatographic method for the simultaneous determination of captopril and hydrochlorothiazide in human plasma samples was developed. Captopril was derivatized with 2,4'-dibromoacetophenone (pBPB) to form a captopril-pBPB adduct. From acidified serum plasma samples, the hydrochlorothiazide and(More)
The charge sharing effect in pixelated CdZnTe (CZT) detectors with a common anode steering grid has been studied. The impact on energy resolution of weighting potential cross-talk and ballistic deficit due to cathode signal shaping has been investigated. A detailed system modeling package considering charge induction, electronic noise, pulse shaping, and(More)
Cs source. The average of both detectors were measured to be cm /V. The detection efficiency of the two detectors was evaluated at several different energies up to 1.3 MeV by comparing with simulated data. It was found that the total counts agree well between the measured data and the simulated data over the studied energy range. However, the measured(More)
Keywords: Semiconductor detector CdZnTe Electron drift velocity Drift time variation Three-dimensional (3D) position-sensitive Cathode waveform Multiple-pixel events Compton imaging a b s t r a c t In pixelated CdZnTe detectors, multiple interaction gamma-ray events are critical because they permit Compton imaging. However, in large-volume CdZnTe crystals,(More)
—The single polarity charge sensing method based on coplanar grid electrodes has demonstrated promising results on CZT detectors having volumes of ~1 cm 3. This paper presents the performance of two coplanar grid CZT detectors having dimensions of 1.5 1 5 1.0 cm 2 , among the largest CZT spectrometers that have been reported. Energy resolutions of 2.3% and(More)