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Preliminary Performance of CdZnTe Imaging Detector PrototypesThe promise of good energy and spatial resolution coupled with high efficiency and near-room-temperature operation has fuelled a large International effort to develop Cadmium-Zinc-Telluride (CdZnTe) for the hard-x-ray region. We present here preliminary results from our development of small-pixel imaging arrays fabricated on 5x5x1-mm and 5x5x2-mm spectroscopy and discriminator-grade material. Each array has 16 (4x4) 0.65-mm gold readout pads on a 0.75-mm pitch, with each pad connected to a discrete preamplifier via a pulse-welded gold wire. Each array is mounted on a 3-stage Peltier cooler and housed in an ion-pump-evacuated housing which also contains a hybrid micro-assembly for the 16 channels of electronics. We have investigated the energy resolution and approximate photopeak efficiency for each pixel at several energies and have used an ultra-fine beam x-ray generator to probe the performance at the pixel boundaries. Both arrays gave similar results, and at an optimum temperature of -20 C we achieved between 2 and 3% FWHM energy resolution at 60 keV and around 15% at 5.9 keV. We found that all the charge was contained within 1 pixel until very close to the pixels edge, where it would start to be shared with its neighbor. Even between pixels, all the charge would be appropriately shared with no apparently loss of efficiency or resolution. Full details of these measurements will be presented, together with their implications for future imaging-spectroscopy applications.
Document ID
19990079360
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Ramsey, B.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Sharma, D. P.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Meisner, J.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Gostilo, V.
(Baltic Scientific Instruments Riga Latvia)
Ivanov, V.
(Baltic Scientific Instruments Riga Latvia)
Loupilov, A.
(Baltic Scientific Instruments Riga Latvia)
Sokolov, A.
(Baltic Scientific Instruments Riga Latvia)
Sipila, H.
(Metorex International Oy Espoo, Finland)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Solid-State Physics
Meeting Information
Meeting: Room Temperature Semiconductor X- and Gamma-Ray Detectors
Location: Vienna
Country: Austria
Start Date: October 11, 1999
End Date: October 15, 1999
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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