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Hannover 2016 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 7: Accelerator Mass Spectrometry and Applications I

MS 7.3: Talk

Thursday, March 3, 2016, 11:45–12:00, f128

Carrier free 10Be/9Be measurement with AMS — •Johannes Lachner1, Marco Ploner1, Aya Sakaguchi2, Peter Steier1, and Robin Golser11Faculty of Physics, University of Vienna, Austria — 2Faculty of Pure and Applied Sciences, University of Tsukuba, Japan

Measuring 10Be/9Be ratios is a powerful tool to date marine deposits in the range of million years if it succeeds to determine minute amounts of the long-lived 10Be and the stable 9Be. The low abundance of Be in natural samples poses challenges to the preparation of samples and to very sensitive measurements of both 10Be and 9Be. The high efficiency of BeO extraction from the Fe2O3 target matrix in combination with a good transmission from the low energy side into the detector enables us to measure 0.1% of the total material during the first hour of sputtering a target. Ion source cross-contamination from intense standards and traces of Be taken up during the preparation of the targets currently limit the background to levels of 0.06 counts per second (10Be) and 15 pA (9Be2+). We present the establishment of the carrier-free Be method at the VERA laboratory and show results of Fe-Mn crusts from the Pacific Ocean dated back to 17 Myr.

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