Köln 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MS: Fachverband Massenspektrometrie
MS 10: Accelerator Mass Spectrometry II
MS 10.4: Talk
Friday, March 14, 2025, 12:00–12:15, HS 2 Chemie
ILIAMS assisted AMS measurements of long-lived radionuclides produced in fusion environment — •Carlos Vivo-Vilches1, Esad Hrnjic1, Martin Martschini1, Lee W. Packer2, Silke Merchel1, Johannes H. Sterba3, Karin Hain1, and Robin Golser1 — 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, Austria
To reliably assess the radionuclide inventories of future nuclear fusion reactors, foils of different materials were irradiated with deuterium-tritium neutrons in the Joint European Torus (JET) reactor, followed by γ-measurements of short-lived radionuclides. The activities of long-lived radionuclides are too low for radiometric techniques. At the Vienna Environmental Research Accelerator (VERA), the potential of AMS for the detection of 91Nb (T1/2 = 680 a), 94Nb (T1/2 = 20300 a) and 93Mo (T1/2 = 4839 a) is investigated. These three radionuclides are produced in Mo-containing materials, e.g. stainless steel SS316. Their measurement requires the use of VERA’s Ion-Laser InterAction Mass Spectrometry (ILIAMS) setup for laser photodetachment to suppress their respective stable isobars: 91Zr, 94Zr and 94Mo, and 93Nb. For 91,94Nb, NbO3– is selected for ILIAMS. Suppression of 91,94ZrO3– is observed just by collisions with the He buffer gas. This suppression is enhanced by photons from a 355 nm laser, which also suppress 94MoO3– by a factor 3900. For 93Mo, MoO2– is selected, while isobaric 93NbO2– is suppressed a factor >106 by our new 637 nm laser.
Keywords: Accelerator mass spectrometry; Nuclear fusion; Niobium-91; Niobium-94; Molybdenum-93