title: Ultra-trace analysis of41Ca in urine by accelerator mass spectrometry: an inter-laboratory comparison.
abstract: A41Ca 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 CaF2for the cesium sputter ion source are robust and don't yield any significant differences in the final result.
authors.affiliation: PRIME Laboratory, Purdue University, West Lafayette, IN 47907, USA.
authors.forename: George S
authors.initials: GS
authors.lastname: Jackson
authors.forename: Darren J
authors.initials: DJ
authors.lastname: Hillegonds
authors.forename: Paul
authors.initials: P
authors.lastname: Muzikar
authors.forename: Brent
authors.initials: B
authors.lastname: Goehring
keywords: 41Ca; Bayesian statistics; accelerator mass spectrometry; interlaboratory comparison