Preparation scheme

The ¹⁰Be/⁹Be ratios were measured at the ETH Zurich Tandem Accelerator Mass Spectrometry (AMS) facility (Kubik and Christl, 2010). The ¹⁰Be concentrations were corrected for ¹⁰Be in the ⁹Be carrier solution and normalised to the ETH secondary standartd S2007N with a nominal value of ¹⁰Be/Be = 28.1 x 10^-12. S2007N has been calibrated with a primary standard ICN 01-5-1, which is produced by K. Nishiizumi and has a nominal value of 2.709 x 10^-11 (Nishiizumi et al., 2007). The 1σ error of S2007N is 2.7%.

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