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/232Th 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).
|Translated title of the contribution||An Inter-Laboratory Assessment of the Thorium Isotopic Composition of Synthetic and Rock Reference Materials|
|Pages (from-to)||65 - 91|
|Number of pages||27|
|Journal||Geostandards and Geoanalytical Research|
|Publication status||Published - Mar 2008|