The Mars Odyssey Gamma Ray Spectrometer (GRS) Corrected Gamma Spectra (CGS) archive contains gamma ray spectra from the Gamma Sensor Head (GSH) corrected to a common energy scale.

 
Citation Boynton, W., ODY MARS GAMMA RAY SPECTROMETER 4 CGS V1.0, ODY-M-GRS-4-CGS-V1.0, NASA Planetary Data System, 2003 2008
Digital Object Identifier (DOI) 10.17189/1519469
Data Set Abstract The Mars Odyssey Gamma-Ray Spectrometer (GRS) is a suite of three instruments working together to collect data that will permit the mapping of elemental concentrations on the surface of Mars. The suite of three instruments, the gamma sensor head (GS), the neutron spectrometer (NS) and the high-energy neutron detector (HEND), are a complimentary set of instruments in that the neutron instruments have better counting statistics and sample to a greater depth than the GS, but the GS determines the abundance of many more elements. A full description of the Mars Odyssey Gamma-Ray Spectrometer instrument can be found in [BOYNTONETAL2002].
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    Additional Information
    Mission Information 2001 MARS ODYSSEY
    Data Set Information ODY-M-GRS-4-CGS-V1.0
    Instrument Host Information ODY
    Instrument Information GRS
    Target Information MARS