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Trapped Radiation Detector

NSSDC ID: 1964-073A-05
Mission Name: Mariner 3
Principal Investigator: Prof. James A. Van Allen


A detector composed of four GM tubes and a solid-state device was designed to detect low-energy cosmic rays and protons (from 500 keV to 11 MeV) and electrons (e .gt. 40 keV and e .gt. 150 MeV) while the spacecraft journeyed to and passed Mars. The detectors were oriented at 70 and 135 deg to the spacecraft roll axis. Because a protective shield failed to eject from the spacecraft, the instruments remained covered, the spacecraft did not attain its prescribed trajectory, and no data of any value were received.

Alternate Names

  • Low Energy Cosmic Ray


  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Prof. James A. Van AllenPrincipal InvestigatorUniversity of Iowa 
Dr. Stamatios M. KrimigisOther InvestigatorApplied Physics
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