Uranium and Thorium Concentration and Isotopic Composition in Five Glass (BHVO-2G, BCR-2G, NKT-1G, T1-G, ATHO-G) and Two Powder (BHVO-2, BCR-2) Reference Materials

Here we report uranium and thorium isotopic ratios and elemental concentrations measured in solid reference materials from the USGS (BHVO-2G, BCR-2G, NKT-1G), as well as those from the MPI-DING series (T1-G, ATHO-G). Specifically created for microanalysis, these naturally-sourced glasses were fused from rock powders. They cover a range of compositions, elemental concentrations and expected isotopic ratios. The U-Th isotopic ratios of two powdered source materials (BCR-2, BHVO-2) were also characterised. These new measurements via multi-collector thermal ionisation mass spectrometry and multi-collector inductively coupled plasma-mass spectrometry can now be used to assess the relative performance of techniques and facilitate comparison of U-Th data amongst laboratories in the geoscience community for in situ and bulk analyses.