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

Research output: Contribution to journalArticlepeer-review

121 Scopus citations

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 (US)
Pages (from-to)65-91
Number of pages27
JournalGeostandards and Geoanalytical Research
Volume32
Issue number1
DOIs
StatePublished - Mar 1 2008

Keywords

  • Consensus values
  • Isotope ratios
  • MC-ICP-MS
  • Rock reference materials
  • Thorium

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