NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Trapped Radiation Detector

NSSDCA 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
  • Mariner3/TrappedRadiationDetector


  • 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. Stamatios M. KrimigisOther InvestigatorApplied Physics
Prof. James A. Van AllenPrincipal InvestigatorUniversity of Iowa
[] NASA Logo -