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Gamma Ray

NSSDCA ID: 1965-007A-06

Mission Name: OSO 2
Principal Investigator:Mr. Kenneth J. Frost


This experiment was designed to detect gamma rays from the sun and from other sources in space, and to analyze their energy spectra from 01. to 0.7 MeV. Of particular interest was the ability to detect the 0.511 MeV electron-positron annihilation line and to study any possible temporal variations. The detector consisted of a 5.08-cm (2-in) long by 2.54-cm (1-in) diameter csi (TL) crystal viewed by a single photomultiplier tube together with a 22.23-cm (8.75-in) long by 14.61 cm (5.75-in) diameter csi (TL) crystal viewed by four photomultiplier tubes. The small crystal was inserted into a well of the larger crystal, the output of the smaller crystal being run in anticoincidence with the large crystal. This output was fed into a pulse height analyzer. This detector and its mode of operation provided a gamma-ray spectrometer which had angular collimation, low background sensitivity, suppression of the Compton continuum, and relatively high photopeak efficiency.

Alternate Names

  • OSO2/GammaRay


  • Solar Physics: Gamma Ray

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Mr. Kenneth J. FrostPrincipal InvestigatorNASA Goddard Space Flight Center
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