Solar Wind Krypton in Genesis Collectors and in Lunar Regolith: Why are they Different?

Abstract

Compared to Xe, Kr demonstrates the smallest isotopic variations among solar system components. At the same time Kr is more sensitive to terrestrial contamination since atmospheric ^(84)Kr/^(132)Xe = 27.7 is the highest among all known solar and presolar components. Therefore higher precision isotopic analyses, and careful control of contamination, are needed to make accurate determinations of Kr isotopic compositions of various solar system components.

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