Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1743..262r&link_type=abstract
In: EUV, X-ray, and gamma-ray instrumentation for astronomy III; Proceedings of the Meeting, San Diego, CA, July 22-24, 1992 (A9
Astronomy and Astrophysics
Astronomy
Computerized Simulation, Cosmic Rays, Monte Carlo Method, Proportional Counters, Spacecraft Charging, X Ray Astronomy, Neutrons, Photons, Solar Activity, Solar Flares
Scientific paper
The influence of the secondary neutrons and photons, produced by cosmic rays 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. The MCNP code has than been used to simulate that 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 mission.
Costa Edgar
Feroci Marco
Giagu Stefano
Rapisarda Massimo
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