Hamburg 2009 – wissenschaftliches Programm
MS 4.7: Vortrag
Dienstag, 3. März 2009, 12:15–12:30, VMP 8 R05
Be-10 and Cl-36 interlaboratory comparisons — •Silke Merchel1,2, Wolfram Bremser3, Vasily Alfimov4, Maurice Arnold1, Georges Aumaître1, Lucilla Benedetti1, Didier L. Bourlès1, Régis Braucher1, Marc Caffee5, Marcus Christl4, L. Keith Fifield6, Robert C. Finkel1,7, Stewart P.H.T. Freeman8, Aarón Ruiz-Gomez9, Peter W. Kubik4, Dylan H. Rood7, Kimikazu Sasa10, Peter Steier11, Stephen G. Tims6, Anton Wallner11, Klaus M. Wilcken8, and Sheng Xu8 — 1CEREGE, Aix-en-Provence, France — 2FZD, Dresden, Germany — 3BAM, Berlin, Germany — 4PSI/ETH Zurich, Switzerland — 5PRIME Lab, Purdue, IN, USA — 6ANU, Canberra, Australia — 7LLNL, Livermore, CA, USA — 8SUERC, East Kilbride, UK — 9CNA, Sevilla, Spain — 10University of Tsukuba, Japan — 11VERA, Wien, Austria
Driven by the progress in AMS and its spreading application within geosciences, measurements of increasing numbers of samples with low isotopic ratios will be required in the future. Therefore, we have examined the linearity of 10Be/9Be as a function of isotope ratio by distributing 3 secondary standards (dilutions of NIST4325: 10−12-10−14) to 9 AMS labs. The problem of low ratio samples is even more crucial for 36Cl mainly due to the high volatility of chlorine. Thus, we have prepared large quantities of 3 36Cl/Cl solutions from a certified 36Cl activity (NIST4943) by dilution with NaCl. AgCl precipitated from these solutions (10−11-10−13) has been distributed to 9 AMS labs. Some measurements are still ongoing. First results from 6 labs for each nuclide show that these interlaboratory exercises are very valuable.