SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Accelerator Mass Spectrometry I

MS 1.1: Hauptvortrag

Dienstag, 7. März 2023, 11:00–11:30, F128

Lasers against barium – Detection of 135Cs in the environment by AMS — •Alexander Wieser1, Johannes Lachner1,2, Silke Merchel1, Martin Martschini1, Anaëlle Magre3, Judith Kobler Waldis4, Oscar Marchhart1, and Robin Golser11University of Vienna, Isotope Physics, Vienna, Austria — 2HZDR, Accelerator Mass Spectrometry and Isotope Research, Dresden, Germany — 3Institut de Radioprotection et de Sûreté Nucléaire, Fontenay-aux-Roses, France — 4Universität Basel, Departement Umweltwissenschaften, Basel, Schweiz

137Cs (T1/2 ≈ 30 yrs) is a high-yield product of nuclear fission and easily detectable via its gamma decay but 137Cs alone without further information is not assignable to an anthropogenic source. The measurement of 135Cs (T1/2 ≈ 2 Myrs) can help identifying the origin of radiocesium. While it is impossible to measure 135Cs radiometrically in the presence of 137Cs, mass spectrometric methods need to suppress stable isobars 135,137Ba and molecules of similar mass. The Ion-Laser Interaction Mass Spectrometry (ILIAMS) setup at the Vienna Environmental Research Accelerator (VERA) does exactly that. Overlapping a 10 W laser beam with the ion beam in a radiofrequency quadrupole, the interfering isobars 135,137Ba are suppressed by seven orders of magnitude, realizing detection limits of 7 · 106 atoms, i.e. ≈ 5 mBq of 137Cs per sample. We will present the progress of our ILIAMS measurements at VERA, with our struggles to reduce cross contamination in the ion source and a focus on Cs measurements of environmental sediment samples prepared from 100 g of soil.

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