Observation of the gamma-ray emission from the Martian surface by the APEX experiment

Details Observation of the gamma-ray emission from the Martian surface by the APEX experiment Observation of the gamma-ray emission from the Martian surface by the APEX experiment

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.341..598d&link_type=abstract

Nature (ISSN 0028-0836), vol. 341, Oct. 19, 1989, p. 598-600.

Astronomy and Astrophysics

Astronomy

6

Gamma Ray Spectra, Mars Probes, Mars Surface, Spaceborne Experiments, Astronomical Spectroscopy, Soviet Spacecraft, Spectrum Analysis, Temporal Distribution, U.S.S.R. Space Program

Scientific paper

The study of gamma-ray emission from planets with a thin atmosphere allows a rough estimation of the chemical composition of their surfaces to be made. Here, results from the gamma-ray APEX experiment on board Phobos 2 are presented. The measured gamma-ray albedo of the Martian surface appears as a large continuum between a few hundred keV and 8 MeV corresponding to a source intensity of 5 photons/sq cm/s/2 pi. There is also evidence for a 511-keV annihilation emission and for a broad contribution of probable nuclear lines between 4 and 7 MeV.

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