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Trapped Radiation Scintillation Counter

NSSDCA ID: 1964-054A-16

Mission Name: OGO 1
Principal Investigator:Dr. Andrei Konradi


The objectives of this experiment were (1) to study the temporal and spatial variations of the trapped particle intensities, pitch angle distributions, and energy spectra of electrons (10 to 100 keV) and protons (120 to 4500 keV), and (2) to determine particle lifetimes, isolate processes by which trapped particles are lost, and define the sources and accelerating mechanisms of trapped particles. The experiment, located in OPEP 2, consisted of a filter wheel, wheel stepping motor, phosphor scintillator, photomultiplier tube, electrometer, and count rate meter. The detector had two entrance apertures for particles, one aligned with the phototube axis and one at 90 deg to this axis. Both protons and electrons could enter the aligned opening and reach the phosphor. Only electrons could enter the 90-deg opening, scatter off a gold disk, and reach the phosphor. The counting rate in the aligned opening measured proton flux, and the current therein measured the total energy flux of electrons, protons, etc. The current in the 90-deg opening measured the electron energy flux. Different thickness absorbers on the wheel provided spectral information. The experiment worked until the absorber wheel stopped on December 2, 1964. Data recorded after this date were unusable.

Alternate Names

  • OGO1/TrappedRadiationScintillationCounter

Facts in Brief

Mass: 2.1 kg
Power (avg): 1 W

Funding Agency

  • NASA-Office of Space Science Applications (United States)


  • Space Physics: Magnetospheric Studies
  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Mr. James M. WilliamsonOther InvestigatorNASA Goddard Space Flight
Mr. Leo R. DavisOther InvestigatorNASA Goddard Space Flight Center
Dr. Robert A. HoffmanOther InvestigatorNASA Goddard Space Flight
Dr. Andrei KonradiPrincipal InvestigatorNASA Johnson Space Center
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