Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..687a&link_type=abstract
(Royal Society, Discussion on Gamma-Ray Astronomy, London, England, Nov. 27, 28, 1980.) Royal Society (London), Philosophical Tr
Astronomy and Astrophysics
Astronomy
5
Astronomical Spectroscopy, Balloon-Borne Instruments, Gamma Ray Spectrometers, Solid State Devices, Background Radiation, Germanium, Line Spectra, Semiconductor Devices
Scientific paper
A description is presented of a program undertaken to investigate gamma-ray lines with the aid of an actively shielded high purity Ge detector cooled by liquid nitrogen. The active NaI(Tl) shielding elements limit the opening angle of the telescope to 5.2 deg. The basic crystal has a gamma-ray detection efficiency of 23% relative to a standard 3 in. x 3 in. NaI(Tl) detector at 1.33 MeV and an energy resolution of 2.5 keV at the same energy. The first flight of the apparatus was in August 1979 at Palestine, Texas and it lasted about 6 1/2 hours. Attention is given to the variation of counting rate of the Ge detector in the energy range from 0.09 to 8.8 MeV, the atmospheric background spectra from the Ge(HP) detector, and the minimum sensitivity of the spectrometer.
Ayre C. A.
Bhat Narayan P.
Owens Alan
Summers W. M.
Thompson Mark G.
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