Long-term reproducibility of multicollector Sr and Nd isotope ratio analysis

High-precision multidynamic analyses for Sr and Nd isotopic standards are reported for a 4-year period on the VG 354® mass spectrometer at Royal Holloway and Bedford New College (RHBNC). The data are assessed in 8 (Nd) or 11 (Sr) subsets separated by major machine maintenance. Within each subset, results for the Sr standard SRM987 show a consistent correlation between the mean triple-collector multidynamic 87Sr/86Sr result, normalised for...