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 language | English (US) |
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Pages (from-to) | 65-91 |
Number of pages | 27 |
Journal | Geostandards and Geoanalytical Research |
Volume | 32 |
Issue number | 1 |
DOIs | |
State | Published - Mar 2008 |
Keywords
- Consensus values
- Isotope ratios
- MC-ICP-MS
- Rock reference materials
- Thorium