Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-04
Astronomy and Astrophysics
Astrophysics
Invited Contribution to the 49th International Symposium on Optical Science and Technology (SPIE), August 2004, Denver, CO, SP
Scientific paper
10.1117/12.558912
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.
Bürger Adri
Groza Michael
Jung Inhwa
Krawczynski Henric
Perkins Jeffrey
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