Hamburg 2009 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: AMS-Applications
MS 4.4: Vortrag
Dienstag, 3. März 2009, 11:30–11:45, VMP 8 R05
Carrier-free Be-10/Be-9 measurements at low energies — •Marcus Christl1, Colin Maden2, Peter W. Kubik1, Arnold Müller1, and Hans-Arno Synal1 — 1Laboratory of Ion Beam Physics, ETH-Zurich, Switzerland — 2Institute of Isotope Geochemistry and Mineral Resources, ETH Zurich, Switzerland
A new method to directly measure the natural Be-10/Be-9 ratio of environmental samples with a compact low energy AMS system (0.6 MV) has been developed recently. This method allows us to use standard sample preparation methods and AMS techniques. In some cases, when the only the relative variation of the natural Be-10/Be-9 ratio is needed, the direct measurement of Be-10/Be-9 significantly reduces sample preparation time, enables higher sample throughput in the lab, provides more precise data, and avoids all problems related to possible systematic offsets between both AMS and ICP-MS.
Applications of carrier free Be-10/Be-9 measurements like dating of manganese crusts or the reconstruction of the solar- or the geomagnetic field are discussed. First results of the newly developed method applied to marine samples will be presented and systematic ion source efficiency studies with artificial samples will be discussed.