Mainz 2026 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 8: Isobar Suppression Techniques
MS 8.2: Vortrag
Freitag, 6. März 2026, 11:30–11:45, N 6
Progress on the ILIAMS-assisted measurements of 91,94Nb and 93Mo at VERA — •Carlos Vivo-Vilches1, Esad Hrnjic1, Kyra Altindag1, Silke Merchel1, Martin Martschini1, Lee W. Packer2, Johannes H. Sterba3, Matic Dokl4, Jixin Qiao4, Erik Strub5, and Karin Hain1 — 1University of Vienna, Faculty of Physics, Vienna, Austria — 2UKAEA, Culham Campus, Abingdon, United Kingdom — 3Center for Labelling and Isotope Production, TRIGA Center Atominstitut, TU Wien, Vienna, Austria — 4Department of Environmental and Resource Engineering, Technical University of Denmark, Roskilde, Denmark — 5Division of Nuclear Chemistry, University of Cologne, Cologne, Germany
At the Vienna Environmental Research Accelerator (VERA) we are developing the AMS of 91Nb, 94Nb and 93Mo to measure their concentrations in Mo-containing alloys irradiated with neutrons from deuterium-tritium fusion. These measurements require the use of the unique Ion-Laser InterAction Mass Spectrometry (ILIAMS) setup to suppress their respective stable isobars: 91Zr, 94Zr and 94Mo, and 93Nb. For 91,94Nb, to achieve isobar suppression, we need to select NbO3–, which is less prolific than other niobium oxide anions. Therefore, we studied the enhancement of its ionization yield by mixing the Nb2O5 powder with Ag and AgO. Estimated 91Nb/93Nb and 94Nb/93Nb blank ratios are 10–14 and 10–10, respectively. Using samples with roughly known amounts of 93Mo, the 93Mo/natMo blank level for VERA has been determined to be lower than 10–12. Precise reference materials for 93Mo AMS will be produced from proton-irradiated Nb foils.
Keywords: Accelerator mass spectrometry; Nuclear fusion; Niobium-91; Niobium-94; Molybdenum-93