Physics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.4263g&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue E2, p. 4263-4272
Physics
14
Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction, Planetology: Solid Surface Planets: Composition, Planetology: Solid Surface Planets: Remote Sensing
Scientific paper
A numerical code has been developed to simulate fast neutron leakage flux from planetary surfaces. These neutrons are produced in copious number by interactions between galactic cosmic rays and the nuclei of surface material. Their leakage flux spectrum depends on the composition of the upper layers of planetary bodies. Measurement of these neutrons allows the mapping of major compositional units. This technique is successfully used on Lunar Prospector data to obtain global geochemical maps of the lunar surface. With the help of simulations, relations between soil composition and neutron fluxes in the fast energy range [500 keV, 10 MeV] are established. The numerical code reproduces correctly the measurements of fast neutrons over the Moon. Variation in the neutron flux between highland and mare soils is calculated. A simple formula is suggested to estimate quickly the integrated fast neutron leakage flux for a given soil composition.
D'Uston Claude
Feldman William C.
Gasnault Olivier
Maurice Sylestre
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