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An inter-laboratory assessment of the thorium isotopic composition of synthetic and rock reference materials

Journal article published in 2008 by Kww Sims ORCID, Jb Gill, Anthony Dosseto, Dl Hoffmann ORCID, Craig Cc Lundstrom, Rw Williams, Lary Ball, Darren Tollstrup, Simon Turner, Julie Prytulak, Jjg Glessner, Jj J. Standish, Tim Elliott
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

We present a concerted international effort to cross-calibrate five synthetic Th isotope reference materials (UCSC Th "A", OU Th "U", WUN, IRMM-35 and IRMM-36), and six rock reference materials (UCSC TML, Icelandic ATHO, USGS BCR-2, USGS W-2, USGS BHVO-2, LV18) using multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS). We then compare our new values with a compilation of literature mass spectrometric data for these reference materials and derive recommended "consensus" 230Th/232 Th values for each. We also present isotope dilution U and Th concentration data for four rock reference materials (UCSC TML, Icelandic ATHO, USGS BCR-2, USGS W-2). © 2008 International Association of Geoanalysts.