Uranium on the Moon: Global distribution and U/Th ratio

Details Uranium on the Moon: Global distribution and U/Th ratio Uranium on the Moon: Global distribution and U/Th ratio

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3710201y&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 10, CiteID L10201

Astronomy and Astrophysics

Astrophysics

9

Geochemistry: Composition Of The Moon, Geochemistry: Major And Trace Element Geochemistry, Solar Physics, Astrophysics, And Astronomy: X-Rays, Gamma Rays, And Neutrinos, Structural Geology: Remote Sensing

Scientific paper

The Kaguya Gamma-Ray Spectrometer uniquely identified uranium gamma-ray lines from the Moon with a superior energy resolution of ˜1%. A global lunar map of uranium distribution is derived for the first time. It was found that uranium abundances vary up to 2 ppm with an average of ˜0.3 ppm, while the average thorium abundance was ˜1.2 ppm. From these analyses, significant variation in U/Th ratio was found in the farside of the Moon that had not been reported by previous observations or in lunar materials. Our observations suggest that the lunar highland is not as uniform as has been long considered.

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