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The EGRET high energy gamma ray telescopeThe Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (GRO) is sensitive in the energy range from about 20 MeV to about 30,000 MeV. Electron-positron pair production by incident gamma photons is utilized as the detection mechanism. The pair production occurs in tantalum foils interleaved with the layers of a digital spark chamber system; the spark chamber records the tracks of the electron and positron, allowing the reconstruction of the arrival direction of the gamma ray. If there is no signal from the charged particle anticoincidence detector which surrounds the upper part of the detector, the spark chamber array is triggered by two hodoscopes of plastic scintillators. A time of flight requirement is included to reject events moving backward through the telescope. The energy of the gamma ray is primarily determined by absorption of the energies of the electron and positron in a 20 cm deep NaI(Tl) scintillator.
Document ID
19920012646
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hartman, R. C. (Max-Planck-Gesellschaft Garching (Germany, F.R.)., United States)
Bertsch, D. L. (Hampden-Sydney Coll. VA., United States)
Fichtel, C. E. (Stanford Univ. CA., United States)
Hunter, S. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kanbach, G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kniffen, D. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kwok, P. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lin, Y. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mattox, J. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mayer-Hasselwander, H. A. (Max-Planck-Inst. fuer Extraterrestrische Physik, Garching, Germany F.R. , United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1992
Publication Information
Publication: The Compton Observatory Science Workshop
Subject Category
Astronomy
Accession Number
92N21889
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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