Low-Energy Gamma Rays in the Atmosphere

Details Low-Energy Gamma Rays in the Atmosphere Low-Energy Gamma Rays in the Atmosphere

Jun 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970saosr.318.....p&link_type=abstract

SAO Special Report #318 (1970)

Physics

5

Scientific paper

The low energy (0.3-10 Mev) gamma ray flux at balloon altitude (3.5 mb) and at medium latitude (≍ 42°), resulting from energetic particle interactions with atmospheric atoms, is calculated from measured particle intensity vs. depth profiles. Electron bremsstrahlung is found to be the dominant source of such photons, with a substantial contribution from positron annihilation gamma rays in the 0.3 - 0.51 Mev region. The intensity of low energy atmospheric photons is found to be strongest in the upwards and sidewards directions. The energy and angular response of a typical low energy detector - a 3" X 3" NaI crystal - is investigated. Finally, the response of such a detector to the atmospheric flux calculated earlier is predicted and found to be in good agreement with experiment.

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