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München 2004 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS 4: Beschleunigermassenspektrometrie (Entwicklung)

MS 4.2: Vortrag

Montag, 22. März 2004, 17:45–18:00, HS 112

Accelerator Mass Spectroscopy of 10Be using BeF — •Michal Grajcar1, Max Döbeli2, Peter W. Kubik2, Hans A. Synal2, Lukas Wacker1, and Martin Suter11Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland — 2Paul Scherrer Institut (PSI), c/o Institute for Particle Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland

10Be is one of the most important long-lived cosmogenic radioisotopes in environmental research and has many dating and tracer applications. A new method is described by which 10Be can be measured with compact AMS systems.

BeF targets were prepared and analysed with an AMS facility operating at 0.6 MV terminal voltage. Selecting the charge state 1+, the particle transmission through the accelerator is about 40% and a final energy for 10Be of 0.8 MeV is obtained. The extraction of 10BeF instead of 10BeO from the ion source has the advantage of reducing 10B intensities in the beam by about 5 orders of magnitude. A high energy resolution ΔE-ER gas ionisation counter was used for the final identification. This detector allows additional boron suppression by more than 5 orders of magnitude. Thus, in total, boron is suppressed by at least 10 orders of magnitude and a measured 10Be/9Be background ratio is below 10−14.

Successful measurements of environmental samples demonstrate the potential of the new method.

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