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Ionising radiation-induced effects in doped germanium FIR photoconductors

Price, M. C., Griffin, Matthew J., Church, S. E., Murray, A. G. and Ade, Peter A. R. 1992. Ionising radiation-induced effects in doped germanium FIR photoconductors. Presented at: ESA Symposium on photon detectors for space instrumentation: ESTEC, Noordwijk, Netherlands, 10-12 November 1992. Published in: Guyenne, T. D. and Hunt, J. J. eds. Proceedings of an ESA Symposium on Photon Detectors for Space Instrumentation : ESTEC, Noordwijk, The Netherlands, 10- 12 November 1992. ESA. SP Paris, France: European Space Agency, pp. 309-312.

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Bulk Ge:Be and Ge:Ga photoconductive devices with a typical crystal size of about 1 mm, are currently the most sensitive detectors for FIR satellite instruments in the wavelength range 40 to 200 micrometers. Due to their high sensitivity and relatively large volume, the performance of these detectors is strongly influenced by ionizing radiation in space. Individual absorption events cause glitches in the data stream which must be rejected; and changes in detector dark current, responsivity and noise arise due to the accumulated ionizing radiation exposure. It is essential to characterize and minimize these effects in order to attain the best overall performance of satellite-borne detectors. Radiation tests in Ge:Be and Ge:Ga (stressed and unstressed) detectors for the ISO (Infrared Space Observatory) Long Wavelength Spectrometer (LWS), a low background FIR astronomical instrument, and SAFIRE (Spectroscopy of an Atmosphere using Far Infrared Emission), a higher background Earth looking instrument, were carried out. The effects of ionizing radiation on the performance parameters of the different detectors types are described and discussed. The effectiveness of curing the detectors by bias boosting is considered, and the implications of the ionizing environment for operation of FIR satellite instruments are outlined.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: European Space Agency
ISBN: 9290922664
Last Modified: 10 Jan 2018 14:48

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