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GM Counter

NSSDCA ID: 1961-015B-01

Mission Name: Injun 1
Principal Investigator:Prof. Louis A. Frank


An Anton type 213 directional Geiger tube detector was used to detect solar X rays in the 2 to 12-A range, electrons (E>40 keV), and protons (E>0.5 MeV). The detector was sampled every second, and the accumulation time for the detector was 61/64 s. The spacecraft had a complex spin-and-tumble motion with a poorly defined period of several minutes. The soft X-ray observations were made at sporadic intervals from June 29, 1961, through August 12, 1962 (about 74 min of data). The experiment performed nominally throughout the life of the spacecraft.

Alternate Names

  • Injun1/GMCounter

Facts in Brief

Mass: 0.5 kg
Power (avg): 0.1 W
Bit rate (avg): 0.256 kbps

Funding Agency

  • Department of Defense-Department of the Navy (United States)


  • Space Physics: Magnetospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Prof. James A. Van AllenOther InvestigatorUniversity of Iowa
Prof. Louis A. FrankPrincipal InvestigatorUniversity of
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