Investigation of Martian H2O and CO2 via orbital gamma ray spectroscopy

Details Investigation of Martian H2O and CO2 via orbital gamma ray spectroscopy Investigation of Martian H2O and CO2 via orbital gamma ray spectroscopy

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.9153e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 10, 1987, p. 9153-9167. NASA-supported research.

Physics

22

Carbon Dioxide, Extraterrestrial Resources, Gamma Ray Spectra, Mars Surface, Water, Mars Atmosphere, Mars Probes, Polar Caps, Space Commercialization, Spacecraft Instruments, Mars, Water, Carbon Dioxide, Gamma Ray Methods, Spectroscopy, Models, Calculations, Atmosphere, Surface, Composition, Production Rate, Ice, Neutrons, Scattering, Radionuclides, Formation, Origin, Attenuation, Techniques, Spectra, Layers, Thickness, Analysis, Volatiles, Dust, Soil, Intensity, Spacecraft Observations, Orbiters, Depth, Di

Scientific paper

The capability of an orbital gamma ray spectrometer to address presently unanswered questions concerning H2O and CO2 on Mars is investigated. The gamma ray signal produced by the Martian atmosphere and by several simple models of Martian surface materials is calculated. Results are reported for: (1) the production of neutrons in the atmosphere and in the subsurface material by cosmic ray interactions, (2) the scattering of neutrons and the resultant neutron energy spectrum and spatial distributions, (3) the reproduction of gamma rays by neutron prompt capture and nonelastic scatter reactions, (4) the production of gamma rays by natural radionuclides, (5) the attenuation of the gamma ray signal by passage through surface materials and the Martian atmosphere, (6) the production of the gamma ray continuum background, and (7) the uncertainty in gamma ray line strengths that results from the combined signal and background observed by the detector.

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