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Proceedings Paper

Thick CZT detectors for spaceborne x-ray astronomy
Author(s): Henric S. Krawczynski; Ira Jung; Jeremy S. Perkins; Arnold Burger; Michael Groza
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Paper Abstract

Cadmium Zinc Telluride (CZT) detectors are having a major impact on the field of hard X-ray astronomy. Without the need for cryogenic cooling they achieve good spatial and energy resolutions over the broad energy range from 10 keV to ~600 keV. In this paper, we briefly review the historical development of detectors used in X-ray astronomy. Subsequently, we present an evaluation of CZT detectors from the company Imarad. The standard 2x2x0.5 cm detectors, contacted with 8x8 In pixels and an In cathode, exhibit FWHM energy resolutions of 7 keV at 59 keV, and 10 keV at 662 keV. A direct measurement of the 662 keV photopeak efficiency gives 67%. We have started a detailed study of the performance of Imarad detectors depending on surface preparation, contact materials, contact deposition, post-deposition detector annealing, and detector passivation techniques. We present first results from contacting detectors with Cr, Ag, Au, and Pt.

Paper Details

Date Published: 21 October 2004
PDF: 13 pages
Proc. SPIE 5540, Hard X-Ray and Gamma-Ray Detector Physics VI, (21 October 2004); doi: 10.1117/12.558912
Show Author Affiliations
Henric S. Krawczynski, Washington Univ. in St. Louis (United States)
Ira Jung, Washington Univ. in St. Louis (United States)
Jeremy S. Perkins, Washington Univ. in St. Louis (United States)
Arnold Burger, Fisk Univ. (United States)
Michael Groza, Fisk Univ. (United States)

Published in SPIE Proceedings Vol. 5540:
Hard X-Ray and Gamma-Ray Detector Physics VI
Arnold Burger; Ralph B. James; Larry A. Franks, Editor(s)

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