Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....52..409d&link_type=abstract
Astronomy and Astrophysics, vol. 52, no. 3, Nov. 1976, p. 409-413.
Astronomy and Astrophysics
Astrophysics
1
Background Noise, Balloon-Borne Instruments, Energy Spectra, Particle Energy, Radiation Effects, X Ray Telescopes, Atmospheric Effects, Cosmic X Rays, Energy Dissipation, Particle Flux Density, Particle Production, Photons, Sodium Iodides
Scientific paper
A theoretical evaluation has been made of the spectral intensity of background noise counts over the energy range 20-200 keV in a balloon-borne astronomical X-ray telescope. The model instrument consisted of a sodium iodide crystal surrounded by a Cu-Sn-Pb graded shield and a thin plastic anticoincidence counter. For energy losses below 100 keV, most of the background noise is derived from higher-energy atmospheric photons which eventually generate Compton electrons in the Na I crystal. At energies above 100 keV, the major source of noise is related to photons which interact by the photoelectric effect in the detector. The calculated background noise spectrum showed good agreement when compared with published experimental data, and was also used to optimize the sensitivity of astronomical hard X-ray telescopes operating in the upper atmosphere.
Dean Anthony J.
Nikiforidis G.
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