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Ion Chamber and GM Tube

NSSDCA ID: 1960-001A-03

Mission Name: Pioneer 5
Principal Investigator:Dr. John R. Winckler


This experiment consisted of a Neher-type integrating ionization chamber and an Anton 302 Geiger counter. The Geiger counter was mounted normal to the spacecraft spin axis. Due to the complex, nonuniform shielding of the detectors, the ion chamber responded quasi-omnidirectionally to protons greater than about 25 MeV while the Geiger counter responded quasi-omnidirectionally to protons greater than about 35 MeV. Energy thresholds fo quasi-omnidirectional responses to electrons were approximately 1.6 and 2.9 MeV for the ion chamber and Geiger counter, respectively. Counts from the Geiger counter and pulses from the ion chamber were accumulated in separate registers and telemetered by both analog and digital systems. The experiment performed normally from launch through May 17, 1960. Telemetry noise limited the timespan of useful data to the period from launch through April 29, 1960.

Alternate Names

  • Pioneer5/IonChamberandGMTube


  • 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
Dr. Robert A. HoffmanOther InvestigatorNASA Goddard Space Flight
Dr. Roger L. ArnoldyOther InvestigatorUniversity of New
Dr. John R. WincklerPrincipal InvestigatorUniversity of Minnesota
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