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Gamma-Ray Spectrometer

NSSDCA ID: 1966-017A-02

Mission Name: Cosmos 111


The gamma-ray spectrometer was designed to assess the composition of the lunar surface by measuring the quantity and energy of gamma-rays emanating from the lunar surface. The instrument, housed inside the satellite, consisted of 40x40 mm NaI(Ti) scintillators, with 32 channel energy resolution over the energy range 0.3-3.0 MeV. Gamma-rays are produced by naturally occurring radioactive elements such as K, Th, and U, and by the interaction of cosmic ray protons and energetic solar flare particles with elements near the surface such as Fe, Si, O, Mg, and H. Gamma-rays can be detected from material on the surface down to a few cm in depth.

Alternate Names

  • Cosmos111/Gamma-RaySpectrometer

Funding Agency

  • Unknown (U.S.S.R)


  • Planetary Science: Geology and Geophysics

Additional Information

Questions and comments about this experiment can be directed to: Dr. David R. Williams



NameRoleOriginal AffiliationE-mail
Dr. P. A. VinogradovGeneral Contact
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