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

Kenneth W W Sims*, James B. Gill, Anthony Dosseto, Dirk L. Hoffmann, Craig C. Lundstrom, Ross W. Williams, Lary Ball, Darren Tollstrup, Simon Turner, Julie Prytulak, Justin J G Glessner, J. J. Standish, Tim Elliott

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

127 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)65-91
Number of pages27
JournalGeostandards and Geoanalytical Research
Volume32
Issue number1
DOIs
Publication statusPublished - Mar 2008

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