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Proceedings Paper

Neutron-induced backgound in proportional counters for x-ray astronomy
Author(s): Massimo Rapisarda; Enrico Costa; Marco Feroci; Stefano Giagu
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Paper Abstract

The influence of the secondary neutrons and photons, produced by cosmic ray interactions with the spacecraft, on the background of X-ray proportional counters used for astronomical observations from satellite, is investigated by means of two Monte Carlo codes. The GEANT3 code has been used to simulate the production and transport of particles and gamma rays in a structure that reproduces the masses and the materials of the satellite Spectrum-X-Gamma, to a relatively high degree of accuracy. Then, the MCNP code has been used to simulate the behavior of the multiwire proportional counters of SXRP, described in detail in a 3-D geometry, exposed to the neutron and gamma flux resulting from the interactions of the primary cosmic protons with the satellite. Preliminary results indicate that the photons produced as secondary particles in the structures of the satellite overwhelm by an order of magnitude those of the diffuse celestial background directly transmitted through the same structures, and that the estimated counting rate induced by the secondary neutrons and photons is comparable with that observed in similar space missions.

Paper Details

Date Published: 8 October 1992
PDF: 10 pages
Proc. SPIE 1743, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy III, (8 October 1992); doi: 10.1117/12.130688
Show Author Affiliations
Massimo Rapisarda, ENEA/CRE Frascati (Italy)
Enrico Costa, Istituto di Astrofisica Spaziale/CNR (Italy)
Marco Feroci, Istituto di Astrofisica Spaziale/CNR (Italy)
Stefano Giagu, CERN (Switzerland)

Published in SPIE Proceedings Vol. 1743:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy III
Oswald H. W. Siegmund, Editor(s)

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