Optimization of the veto shield for the INTEGRAL spectrometer SPI with Monte Carlo simulations

Details Optimization of the veto shield for the INTEGRAL spectrometer SPI with Monte Carlo simulations Optimization of the veto shield for the INTEGRAL spectrometer SPI with Monte Carlo simulations

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2806..234g&link_type=abstract

Proc. SPIE Vol. 2806, p. 234-244, Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions, Brian D. Ramsey; Thomas A. Parne

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Scientific paper

Using Monte-Carlo simulations, an optimization of the mass distribution of the scintillator crystals, which constitute the veto shield of the spectrometer SPI on board of INTEGRAL, has been performed. Special emphasis was put on a realistic model for the radiation environment in the satellite orbit. All the components of the radiation (gamma- rays, protons and electrons) in space were taken into account regarding their relative fluxes. Furthermore the radiation produced by nuclear reactions within the spacecraft structure was estimated using a separate computer code. A simple realistic mass model of the spectrometer with special consideration of the holding structure of the crystals and other material within the opening angle of the spectrometer, was implemented. Different geometries for background reduction were analyzed and the results are presented. Experiments concerning the behavior of the radiation damage in the scintillator crystals are presented. They give important hints for methods to avoid an increase in the background due to the radiation induced degradation of the crystals.

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