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Proceedings Paper

Optimization of the veto shield for the INTEGRAL spectrometer SPI with Monte Carlo simulations
Author(s): Robert Georgii; Giselher G. Lichti; Thomas Kirchner; Volker Schoenfelder; Peter von Ballmoos; Pierre Jean; Pierre Mandrou; Juan E. Naya; Gilbert Vedrenne; Bertrand Cordier; Nene Diallo
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Paper Abstract

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.

Paper Details

Date Published: 18 October 1996
PDF: 11 pages
Proc. SPIE 2806, Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions, (18 October 1996); doi: 10.1117/12.253982
Show Author Affiliations
Robert Georgii, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Giselher G. Lichti, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Thomas Kirchner, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Volker Schoenfelder, Max-Planck-Institut fuer Extraterrestrische Physik (Germany)
Peter von Ballmoos, Ctr. d'Etude Spatiale des Rayonnements (France)
Pierre Jean, Ctr. d'Etude Spatiale des Rayonnements (France)
Pierre Mandrou, Ctr. d'Etude Spatiale des Rayonnements (France)
Juan E. Naya, Ctr. d'Etude Spatiale des Rayonnements (France)
Gilbert Vedrenne, Ctr. d'Etude Spatiale des Rayonnements (France)
Bertrand Cordier, CEA Saclay/SAP (France)
Nene Diallo, CEA Saclay/SAP (France)

Published in SPIE Proceedings Vol. 2806:
Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions
Brian D. Ramsey; Thomas A. Parnell, Editor(s)

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