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Proceedings Paper

The effects of proton-induced radiation damage on compound-semiconductor X-ray detectors
Author(s): Alan Owens; Lauri Alha; Hans Andersson; Marcos Bavdaz; Guy Brammertz; Kerttuli Helariutta; Anthony Peacock; V. Lamsa; Seppo Arvo Anter Nenonen
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Paper Abstract

We report the results of a series of experiments designed to assess the relative radiation hardness of a range of compound semiconductor X-ray detectors. The specific compounds tested were GaAs, InP, CdZnTe, HgI2 and TlBr, along with an elemental Si device. To allow meaningful comparisons, all devices were of a similar size and, with the exception of the InP detector, had sub-keV energy resolution at 5.9 keV. The irradiations were carried out using the University of Helsinki’s Cyclone 10/5 10 MeV proton cyclotron. Each detector was given six consecutive exposures - the integral fluences being; 2.66 x 109 p cm-2, 7.98 x 109 p cm-2, 2.65 x 1010 p cm-2, 7.97 x 1010 p cm-2, 1.59 x 1011 p cm-2, and 2.65 x 1011 p cm-2, respectively. In Si, these correspond to absorbed radiation doses of 2, 6, 20, 60, 120 and 200 krads. During the exposures, the detectors were kept unbiased and at room temperature. After each irradiation, the effects of the exposure were assessed, both at room temperature and at a reduced temperature using 55Fe, 109Cd and 241Am radioactive sources. It was found that with the exception of the HgI2 and TlBr detectors all materials showed varying degrees of damage effects.

Paper Details

Date Published: 29 September 2004
PDF: 9 pages
Proc. SPIE 5501, High-Energy Detectors in Astronomy, (29 September 2004); doi: 10.1117/12.579894
Show Author Affiliations
Alan Owens, European Space Agency/ESTEC (Netherlands)
Lauri Alha, Univ. of Helsinki (Finland)
Hans Andersson, Metorex International Oy (Finland)
Marcos Bavdaz, European Space Agency/ESTEC (Netherlands)
Guy Brammertz, European Space Agency/ESTEC (Netherlands)
Kerttuli Helariutta, Univ. of Helsinki (Finland)
Anthony Peacock, European Space Agency/ESTEC (Netherlands)
V. Lamsa, Metorex International Oy (Finland)
Seppo Arvo Anter Nenonen, Metorex International Oy (Finland)

Published in SPIE Proceedings Vol. 5501:
High-Energy Detectors in Astronomy
Andrew D. Holland, Editor(s)

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