10Be analyses with a compact AMS facility - Are BeF2 samples the solution?

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Abstract

The injection of 10BeF- instead of 10BeO- into a compact accelerator mass spectrometry system with a terminal voltage of 0.58 MV was investigated, because BF- molecules are unstable and isobaric interference of 10B with 10Be can thus be significantly reduced. We describe the method we developed to prepare BeF2 samples. 10Be was measured in a segmented gas ionization detector. Separation of 10Be from 10B could be achieved both for ions in the 1+ charge state with an energy of 0.8 MeV and in the 2+ charge state with an energy of 1.4 MeV The 2+ ions are better separated, whereas the 1+ charge state has a higher transmission. 10Be/9Be ratios (∼10-12) in a suite of rock samples were successfully determined for exposure dating in either charge state and compared with measurements made on the 6MV tandem.

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Wacker, L., Grajcar, M., Ivy-Ochs, S., Kubik, P. W., & Suter, M. (2004). 10Be analyses with a compact AMS facility - Are BeF2 samples the solution? In Radiocarbon (Vol. 46, pp. 83–88). University of Arizona. https://doi.org/10.1017/s0033822200039382

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