NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 36 of 1036
Preliminary Performance of CdZnTe Imaging Detector Prototypes
Author and Affiliation:
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)
Abstract: The 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.
Publication Date: Jan 01, 1999
Document ID:
19990079360
(Acquired Oct 08, 1999)
Subject Category: SOLID-STATE PHYSICS
Document Type: Reprint
Meeting Information: Room Temperature Semiconductor X- and Gamma-Ray Detectors; 11-15 Oct. 1999; Vienna; Austria
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: IMAGING TECHNIQUES; PIXELS; IMAGE ENHANCEMENT; SPATIAL RESOLUTION; IMAGE RESOLUTION; CADMIUM TELLURIDES; ZINC TELLURIDES; SPECTROSCOPY
Availability Source: Other Sources
Availability Notes: Abstract Only;
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 22, 2011
Contact Us