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Charged Particle Induced Radiation damage of Germanium Detectors in Space: Two Mars Observer Gamma-Ray Detectors
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Author and Affiliation:
Bruekner, J.(Max-Planck-Inst. fuer Chemie, Mainz, Germany);
Koenen, M.(Max-Planck-Inst. fuer Chemie, Mainz, Germany);
Evans, L. G.(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Starr, R.(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Bailey, S. H.(Arizona Univ., Tucson, AZ United States);
Boynton W. V.(Arizona Univ., Tucson, AZ United States)
Abstract: The Mars Observer Gamma-Ray Spectrometer (MO GRS) was designed to measure gamma-rays emitted by the Martian surface. This gamma-ray emission is induced by energetic cosmic-ray particles penetrating the Martian surface and producing many secondary particles and gamma rays. The MO GRS consisted of an high-purity germanium (HPGe) detector with a passive cooler. Since radiation damage due to permanent bombardment of energetic cosmic ray particles (with energies up to several GeV) was expected for the MO GRS HPGe crystal, studies on radiation damage effects of HPGe crystals were carried on earth. One of the HPGe crystals (paradoxically called FLIGHT) was similar to the MO GRS crystal. Both detectors, MO GRS and FLIGHT, contained closed-end coaxial n-type HPGe crystals and had the same geometrical dimensions (5.6 x 5.6 cm). Many other parameters, such as HV and operation temperature, differed in space and on earth, which made it somewhat difficult to directly compare the performance of both detector systems. But among other detectors, detector FLIGHT provided many useful data to better understand radiation damage effects.
Publication Date: Jan 01, 1997
Document ID:
19970026516
(Acquired Sep 17, 1997)
Accession Number: 97N25789
Subject Category: SPACE RADIATION
Document Type: Conference Paper
Publication Information: Second Conference on the High Energy Radiation Background in Space; 23-26; (NASA-CP-3353); (SEE 19970026512)
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: GAMMA RAY SPECTROMETERS; ENERGETIC PARTICLES; MARS OBSERVER; RADIATION DAMAGE; CHARGED PARTICLES; COSMIC RAYS; GERMANIUM
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