Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..341e&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 341.
Other
4
Lunar Soil, Argon Isotopes, Solar Wind, Lunar Composition, Breccia, Xenon Isotopes, Calibrating, Lunar Surface, Helium, Neon, Uranium 235, Nuclear Fission
Scientific paper
Our knowledge of solar-wind activity during the last several billion years comes mainly from the study of variations of the isotopic compositions of trapped He, Ne, Ar, and N in the surface layer of lunar soil grains. The study of such variation requires knowledge of the antiquity of a particular sample, that is, the time when a sample was exposed to solar and lunar atmospheric particles. A practical and sensitive antiquity indicator is the ratio Ar-40/Ar-36 of trapped Ar. The authors present new data on breccia 14307 and some other soils and breccias that support a previous calibration of the evolution of Ar-40/Ar-36 with time based on the quantity of Xe-136 produced by neutron-induced fission of U-235 in soils 74001 and 74261.
Eugster Otto
Polnau Ernst
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