Fig. 1From: Isotopic variations of Sm, Gd, Er and Yb found in planetary materials caused by neutron-capture reactions in natureCorrelation diagrams a between 149Sm/152Sm and 150Sm/152Sm (Sm three-isotope plot) and b between 157Gd/160Gd and 158Gd/160Gd (Gd three-isotope plot) for a series of lunar regolith samples collected from the A-15 drill stem. The isotopic data are given by Hidaka et al. (2000)Back to article page