urn:nasa:pds:context:instrument:ody.grs 1.0 1.15.0.0 Product_Context urn:nasa:pds:context:instrument:grs.ody 2021-06-09 1.0 Updated the information model, LID, and other corrections. urn:nasa:pds:context:instrument_host:spacecraft.ody instrument_to_instrument_host 10.1023/B:SPAC.0000021007.76126.15 Boynton, W., Feldman, W., Mitrofanov, I. et al. (2004) The Mars Odyssey Gamma-Ray Spectrometer Instrument Suite, Space Science Reviews, 110, 37-83. GAMMA RAY SPECTROMETER Spectrometer Gamma Ray The Gamma-Ray Spectrometer (GRS) is part of he Mars Odyssey Gamma-Ray Spectrometer suite. The chief scientific objectives is to quantitatively map the elemental abundances of the Martian surface.