Characterization of the in-flight degradation of the INTEGRAL/SPI detectors

Details Characterization of the in-flight degradation of the INTEGRAL/SPI detectors Characterization of the in-flight degradation of the INTEGRAL/SPI detectors

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nimpa.554..320l&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 554, Issue 1-3, p. 320-330.

Physics

3

Scientific paper

SPI is a high spectral resolution gamma ray telescope which was launched on 2002 October 17 on-board INTEGRAL (INTErnational Gamma Ray Astrophysics Laboratory). The SPI camera consists of 19 high-purity germanium detectors that cover an energy range of 20 keV 8 MeV with an energy resolution of 2 8 keV FWHM. We describe the methods used for the determination of the effects of radiation damage on the SPI detectors. Degradation rate and recovery by annealing are quantified. Using instrumental background lines due to radioisotopes from natural decay chains and from cosmic ray interactions, we found that the variations of detectors efficiency are low. Finally, the impact of the detector degradation on the energy calibration has been investigated.

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