Uncalibrated Gamma SpectraThe uncalibrated gamma spectra data, or "raw" gamma spectra, are composed of the raw, uncorrected gamma spectra obtained by the Gamma Subsystem (GS), or gamma sensor head, which includes associated timing and spatial information. The spectra consists of the cumulative counts of gamma rays at the detector over one pixel, binned into 16,384 channels, based on energy. The times listed (sc_ev_time, UTC time, and spatial fields) all denote the center of the collection interval (also called a "pixel").
More information on all uncalibrated data types, including gamma data, may be found in the EDR Dataset Description.
Overview of Uncalibrated DataUncalibrated data are raw data that has had associated timing and spatial information added. A full description may be found in the 2001 Mars Odyssey Gamma Ray Spectrometer EDR NASA Level 0 Software Interface Specification (EDR SIS).
Gamma-Ray Spectrometer Instruments BackgroundThe Mars Odyssey Gamma-Ray Spectrometer (GRS) is a suite of three instruments working together to collect data that map the elemental concentrations on the surface of Mars. The three instruments are: