SAMOP 2023 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Accelerator Mass Spectrometry II
MS 6.8: Vortrag
Donnerstag, 9. März 2023, 16:15–16:30, F128
Sample preparation for accelerator mass spectrometry (AMS) – Approach to identify potential 10Be contamination sources — •Silke Merchel1,2, Johannes Lachner1,2, Oscar Marchhart1, Georg Rugel2, and Alexander Wieser1 — 1University of Vienna, Faculty of Physics, Isotope Physics, Austria — 2Helmholtz-Zentrum Dresden-Rossendorf, Germany
In the last decades, AMS has largely improved in the direction of lower detection limits, especially for applications of 10Be/9Be in Earth and environmental sciences. However, potential sources of 10Be contamination while chemical sample preparation are often known but rarely identified in detail and quantified, which would be the first step to reduce these unwanted contributions. Thus, we have aimed at investigating 10Be in (a) deionised/subboiled water, (b) commercial 27Al carrier solutions, (c) 9Be minerals and (d) cation exchange materials differently precleaned before first use.
For better quantification, we have e.g., varied 27Al amounts and used 27Al carriers from different companies. Though, it was partially hard to distinguish in-between "single" 10Be sources and between other sources like laboratory "dust" and cross-contamination (in lab and ion source) at the <4x10−15 level.
To conclude, our general recommendation is to minimize the amounts of water, ion exchange materials and 27Al carrier. For ultra-low-level 10Be/26Al dating, subboiled water and customised Al carriers from minerals might be advantageous. The good news, cross-contamination in an AMS chemistry lab in use for >12 years – for samples orders of magnitude different in 10Be/9Be – is negligible.