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Beryllium-7 at DREsden Accelerator Mass Spectrometry

Rugel, G.; Merchel, S.; Scharf, A.; Querfeld, R.; Steinhauser, G.; Tiessen, C.

Abstract

Half-lives of routine accelerator mass spectrometry (AMS) nuclides typically range from thousands to millions of years. We measured short-lived 7Be (T1/2 = 53.2 d) at the DREsden AMS-facility (DREAMS) [1] as low as 90 mBq, which can be challenging for rapid γ-counting. Simultaneous determination of 7Be and 10 Be (T1/2= 1.387 Ma) via AMS is advantageous for improved understanding of production, transport, and deposition of atmospherically produced 7,9,10Be [2].
Data was normalized to a 7 Be sample produced via 7Li(p,n)7Be, measured by γ-counting and chemically processed to BeO after adding low-level 9Be carrier (7Be/9Be ≈ 10-12). The isobar 7Li is completely eliminated by chemistry and the degrader foil technique (at detector 7Be4+, 10.2 MeV, no 7Li4+ possible). The blank ratio of 5 × 10-16 7Be/9Be (0.8 mBq) and simple and fast chemistry allows for the measurement of rainwater samples, collected in Germany, as small as 10 mL corresponding to a few times 10-14 7Be/9Be [3,4].
Thanks to D. Bemmerer (HZDR) and G. György (ATOMKI, Hungary) for help with the 7Be normalization material.
[1] G. Rugel et al., NIMB 370 (2016) 94.
[2] A.M. Smith et al., NIMB 294 (2013) 59.
[3] R. Querfeld et al., JRNC 314 (2017) 521.
[4] C. Tiessen et al. JRNC (to be submitted).

Keywords: Be-7; AMS

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