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\ud
accurate determinations of Kr isotopic compositions of various
solar system components
