The EGRET high energy gamma ray telescope

Details The EGRET high energy gamma ray telescope The EGRET high energy gamma ray telescope

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..116h&link_type=abstract

In its The Compton Observatory Science Workshop p 116-125 (SEE N92-21874 12-90)

Astronomy and Astrophysics

Astronomy

10

Electron-Positron Pairs, Gamma Ray Astronomy, Gamma Ray Observatory, Gamma Ray Telescopes, Gamma Rays, Hodoscopes, Pair Production, Scintillation Counters, X Ray Telescopes, Digital Systems, Electrons, Metal Foils, Positrons, Sensitivity, Tantalum

Scientific paper

The 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.

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