Ultra-trace analysis of ~(41)Ca in urine by accelerator mass spectrometry: An inter-laboratory comparison

摘要

A ~(41)Ca interlaboratory comparison between Lawrence Livermore National Laboratory (LLNL) and the Purdue Rare Isotope Laboratory (PRIME Lab) has been completed. Analysis of the ratios assayed by accelerator mass spectrometry (AMS) shows that there is no statistically significant difference in the ratios. Further, Bayesian analysis shows that the uncertainties reported by both facilities are correct with the possibility of a slight under-estimation by one laboratory. Finally, the chemistry procedures used by the two facilities to produce CaF_2 for the cesium sputter ion source are robust and do not yield any significant differences in the final result.