Matthew Petryk

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New results from testing an array of 6<formula formulatype="inline"> <tex Notation="TeX">$\,\times\,$</tex></formula>6<formula formulatype="inline"> <tex Notation="TeX">$\,\times\,$</tex></formula>15 mm<formula formulatype="inline"> <tex Notation="TeX">$^{3}$</tex></formula> virtual Frisch-grid CdZnTe (CZT) detectors with common-cathode readout for charge(More)
We discussed the design implementation and results from testing 2 &#x00D7; 2-, 3 &#x00D7; 3-, and 2 &#x00D7; 4-arrays of 6&#x00D7;6 &#x00D7;15 mm<sup>3</sup> CdZnTe virtual Frisch-grid detectors. In these measurements we employed a data acquisition system based on the H3D ASIC developed by BNL's Instrumentation Division in collaboration with the University(More)
We present our results from testing 15&#x00D7;15&#x00D7;10 mm<sup>3</sup> CdZnTe pixelated detectors using a readout system based on the H3D ASIC. Data obtained with an uncollimated <sup>137</sup>Cs source helped reveal details of the operational principle of such devices, and how the pulse-processing electronics may influence their performance. The(More)
We developed a robust and low-cost array of virtual Frisch-grid CdZnTe detectors coupled to a front-end readout application-specific integrated circuit (ASIC) for spectroscopy and imaging of gamma rays. The array operates as a self-reliant detector module. It is comprised of 36 close-packed 6 × 6 × 15 mm(3) detectors grouped into 3 × 3 sub-arrays of 2 × 2(More)
The goal of our study was twofold: To determine the distribution of signals in position-sensitive CdZnTe (CZT)-based virtual Frisch-grid detectors (VFGDs) with side-sensing pads, and to evaluate the feasibility of accurately measuring the X- and Y-coordinates where a photon interaction occurs within a single VFGD module. Accordingly, we collected signals(More)
We evaluated the performance of a position-sensitive virtual Frisch-grid (VFG) CdZnTe detector, 6 mm &#x00D7;6 mm &#x00D7;15 mm, via sensing strips on its side surfaces. Once the signals were collected from the anode, and from four or eight strips attached to the detector's sides, we assessed the anode's energy spectra and derived histograms from the side(More)
Homogeneity of properties related to material crystallinity is a critical parameter for achieving high-performance CdZnTe (CZT) radiation detectors. Unfortunately, this requirement is not always satisfied in today's commercial CZT material due to high concentrations of extended defects, in particular subgrain boundaries, which are believed to be part of the(More)
Position-sensitive virtual Frisch-grid (VFG) CdZnTe (CZT) detectors offer a unique capability for correcting the response nonuniformities caused by crystal defects. This allowed us to achieve high energy resolution, while using typical-grade commercial CZT crystals with relaxed requirements to their quality, thus reducing the overall cost of detectors.(More)
The longer electron lifetime of today's CdZnTe (CZT) crystals allows for free carriers to travel longer distances in the crystals, which means that, in principle, thicker devices could be fabricated. These thicker CZT devices would offer greater detection efficiency for high-energy gamma-ray detectors. However, up to now, the thicknesses and sizes of actual(More)
Modélisation du Transfert de Masse en Milieu Hétérogène et Nanoporeux, Université Technique d’Etat Ivan Pul’uy, Ternopil, 46001 Ukraine; E-mail : Méthodologie RMN, UMR 7565 CNRS Nancy Université, 54506 Vandoeuvre-les-Nancy Cedex, France LEMTA, UMR 7563 CNRS Nancy Université, 54504 Vandoeuvre-les-Nancy Cedex, France Physique(More)
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