Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24...39a&link_type=abstract
In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 39-40 (SEE N94-12015 01-91)
Physics
Aluminum Isotopes, Beryllium Isotopes, Chlorine, Cosmology, Impact Melts, Lunar Geology, Lunar Rocks, Lunar Soil, Nuclides, Solar Cosmic Rays, Spectroscopic Analysis, Glass Coatings, Mass Spectroscopy, Radioactive Isotopes
Scientific paper
Eleven samples were ground from the glass coated surface of lunar rock 64455,82 with an average depth resolution of 50 microns and were measured for Be-10, Al-26, and Cl-36 using AMS (accelerator mass spectrometry). Results show no evidence of SCR (solar cosmic ray) effects. The flat cosmogenic nuclide profiles and activity levels are consistent with a 2 My exposure history for the rock and a sample location on the bottom of the rock. These AMS measurements are some of the most precise ever obtained for these three nuclides. This precision and the demonstrated fine depth resolution will enable us to conduct a number of detailed studies of depth effects in lunar and meteoritic samples, including investigating SCR effects in the surface exposed top of the glass coating of 64455 and possibly in the underlying rock.
Arnold James R.
Caffee Marc W.
Finkel Robert C.
Kohl C. P.
Nishiizumi Kuni
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