Physics – Space Physics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ijrsp...5...13m&link_type=abstract
(Symposium on Earth's Near Space Environment, New Delhi, India, Feb. 18-21, 1975.) Indian Journal of Radio and Space Physics, vo
Physics
Space Physics
3
Background Radiation, Balloon-Borne Instruments, Monte Carlo Method, X Ray Density Measurement, X Ray Spectra, X Ray Telescopes, Computerized Simulation, Diffuse Radiation, Primary Cosmic Rays, Secondary Cosmic Rays
Scientific paper
Balloon-borne measurements of the diffuse (primary) X-ray background flux are limited by the (secondary) X-ray background produced by cosmic rays in the atmosphere and the instrument environment. Thus the isolation of the primary flux is dependent on the estimation of the secondary X-ray flux. The secondary contribution is obtained from the growth curves (counting rate vs atmospheric depth) by fitting an assumed functional form to the data obtained for altitudes below about 10-15 g/sq cm and extrapolating it to the ceiling altitude. This paper presents results of Monte Carlo computerized simulation of the growth curves for a given incident primary X-ray spectrum in the region above 10 g/sq cm and the deduced secondary component from the observed data. The calculations take account of photoelectric attenuation and multiple Compton scattering.
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