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SAMOP 2021 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry II

MS 8.4: Vortrag

Donnerstag, 23. September 2021, 14:45–15:00, H3

Increasing the ionization yield for the detection of 236U and 233U by AMS — •Michael Kern, Karin Hain, Peter Steier, Andreas Wiederin, and Robin Golser — University of Vienna, Faculty of Physics - Isotope Physics, Vienna, Austria

The detection efficiency of Accelerator Mass Spectrometry for uranium isotopes 236U or 233U is mainly limited by the rather low yield of the corresponding negative ions extracted from a caesium sputter ion source (≈ 10−4). With our new sample preparation method environmental U is embedded in only 200 µg Fe2O3 matrix which is then mixed with PbF2. Extracting U as UF5 instead of UO yields an improvement in detection efficiency of up to a factor of 10. Thus significantly shortened measurement duration can be obtained, while maintaining the same statistical uncertainty. UF5 extraction seems advantageous for the suppression of molecular isobaric background (233ThH3+, 233UH3+) and allows operation at lower He stripper gas pressure. This presentation will give detailed insights on the new sample preparation as well as ion current characteristics and method verification.

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