Computer Science
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rbrfi...5...15m&link_type=abstract
Revista Brasileira de Fisica, vol. 5, Apr. 1975, p. 15-23. In French.
Computer Science
Atmospheric Radiation, Background Radiation, Balloon-Borne Instruments, Energy Spectra, Gamma Rays, Stratosphere, Background Noise, Cosmic Rays, Experiment Design, Magnetic Rigidity, Optical Coupling, Photomultiplier Tubes, Photon Density, Radiation Detectors, X Ray Sources
Scientific paper
A technique is described for measuring the cosmic gamma-ray spectrum in the range 1 to 15 MeV using an omnidirectional detector flown in a stratospheric balloon. The experimental package comprises a 10.16-cm by 10.16-cm NaI(Tl) crystal scintillator protected by a 1-mm thick aluminum box optically coupled to a photomultiplier by a 2-mm thick Perpex disk deposited on the NaI(Tl). This scintillator is placed in plastic well, 2 cm thick, coupled to a photomultiplier. Pulses from the first photomultiplier are amplified and transmitted to a 128-channel encoder. With this equipment, the spectrum of diffuse background noise was obtained by comparison of the measured and calculated fluxes at 4 mb and at 12 GV geomagnetic cutoff.
Dutra Severino L. G.
Mandrou Pierre
Martin Inácio M.
Vedrenne Gilbert
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