Freiburg 2024 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Accelerator Mass Spectrometry III
MS 7.2: Vortrag
Donnerstag, 14. März 2024, 11:30–11:45, HS 3042
AMS of I-129 at low energies - 10 years later — Christof Vockenhuber1,2, •Núria Casacuberta Arola1,2, and Marcus Christl1 — 1Laboratory of Ion Beam Physics, ETH Zurich, Zurich, Switzerland — 2Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
For the DPG 2014 conference in Berlin we had a contribution on AMS of I-129 at low-energy AMS systems. Focusing on the 500 kV Tandy at the Laboratory of Ion Beam Physics at ETH Zurich, we were discussing the advantages but also the challenges of measuring this long-lived radionuclide at low energies with a special focus on cross contamination and its correction.
Here we will provide a review of I-129 AMS at low energies, after the experience we gained in the last 10 years by measuring thousands of samples. Although most of the measurements were performed in the AMS Tandy system, since a few years the 300 kV multi-isotope systems MILEA is also in our portfolio. MILEA helped in expanding the measurement capabilities with a new type of ion source and an improved ion-optical setup. We will compare measurements performed at both Tandy and MILEA and discuss the performance with the focus on background, cross contamination and detection limit. Finally, we will also show a few examples of the application of I-129 as an anthropogenic ocean tracer from the past 10 years.
Keywords: AMS; artificial radionuclides; I-129; ocean circulation; ion source