Challenges and opportunities in high-precision Be-10 measurements at CAMS |
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| Authors: | Dylan H Rood Sarah Hall Thomas P Guilderson Robert C Finkel Thomas A Brown |
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| Affiliation: | 1. Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;2. Department of Earth Science, University of California, Santa Barbara, CA 93106, USA;3. Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA;4. Department of Ocean Sciences, and Institute of Marine Sciences, University of California, Santa Cruz, CA 95064, USA;5. CEREGE (Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement), 13545 Aix en Provence Cedex 4, France;6. Department of Earth and Planetary Sciences, University of California, Berkeley, CA 94720, USA |
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| Abstract: | We determined the overall efficiency for 10Be of the high-intensity LLNL modified Middleton cesium sputter source in combination with the CAMS FN mass spectrometer. BeO? ionization efficiency is >3%. Charge exchange efficiency including transmission through the tandem for 7.5 MeV Be+3 is ～34%, resulting in a total system efficiency of just over 1%. At this efficiency and with very low backgrounds, we estimate our detection limit to be ～1000 10Be atoms. Cathodes prepared with only ～80 μg of 9Be show only an ～33% reduction in 9Be beam current compared to a sample with ～200 μg. These same samples, prepared from 07KNSTD1032 standard material, contained 1 × 107 and 5 × 106 10Be atoms and exhibited similar ionization and total system efficiency. These results demonstrate the feasibility of pursuing applications that require precise measurement of samples with low 10Be concentrations and/or small sample size. |
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