Isotopic composition and distribution of xenon in the granulometric fractions of the Luna-16 and Luna-20 regolith

Details Isotopic composition and distribution of xenon in the granulometric fractions of the Luna-16 and Luna-20 regolith Isotopic composition and distribution of xenon in the granulometric fractions of the Luna-16 and Luna-20 regolith

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988geokh.....1339s&link_type=abstract

Geokhimiia (ISSN 0016-7525), Sept. 1988, p. 1339-1351. In Russian.

Computer Science

Lunar Rocks, Lunik Lunar Probes, Regolith, Xenon Isotopes, Galactic Cosmic Rays, Lunar Soil, Solar Cosmic Rays

Scientific paper

The isotopic composition and distribution of Xe in the granulometric fractions of the Luna-16 and -20 regolith samples were analyzed. Four types of Xe were encountered: (1) cosmogenic Xe components which are the products of spallation of nuclei of Ba and REEs by protons from Galactic and solar radiation, (2) surface-correlated Xe of the SUCOR type, (3) an anomalous Xe component with an excess of heavy and neutron-deficient isotopes, relative to Xe-130, and (4) an anomalous component of Xe with excesses of Xe-130, Xe-128, and Xe-124 and relatively low values of Xe-136, Xe-134, Xe-132, Xe-131, and Xe-129. The latter Xe type is considered to be the Xe of the ancient solar wind. The data indicate that the redistribution of volatiles and the addition of outside material are characteristic for moon rocks. Therefore, the isotopic composition of solar-wind Xe, which at present is considered to be a geochemical constant, is a result of the mixing of various compounds.

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