Rostock 2019 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 4: Accelerator Mass Spectrometry and Applications

MS 4.7: Talk

Wednesday, March 13, 2019, 12:00–12:15, U A-Esch 2

Nuclear Forensics on the 135Cs/137Cs ratio by ICP-QQQ-MS — •Dorian Zok, Rebecca Querfeld, Lena Grüger, and Georg Steinhauser — Leibniz Universität Hannover - Institute of Radioecology and Radiation Protection

The atmospheric fallout and the Chernobyl disaster have released a lot of radioactive material, which has contaminated Germany. The most famous element is the cesium with his directly produced radioactive fission isotope 137Cs (T1/2 = 30 a). Just with the 137Cs it is not possible to say something about the origin. The remedy is the ratio 135Cs/137Cs with the long-living isotope 135Cs (T1/2 = 2.3 Ma). Additionally, the formation of the daughter 135Cs from the mother 135Xe depends on the currently occurring neutron flux. The analyse is done by a Triple-Quadrupole-Mass spectrometer (ICP-QQQ-MS). This allows a further suppression of isobaric interference by the use of a reaction gas after a previous element-specific separation. In the case of cesium the nitrous oxide N2O reacts with the isobaric Barium (Ba) to barium oxide (BaO+). The radioecological questions of the wild boar paradox with the not decreasing amounts of radiocesium and the general analyse of environmental and food samples are in the focus of the research. Another point is the origin analyse of radioactive, amorphous glass beads out of the destroyed reactors in Fukushima, with should be achieved with a spatially resolved laser ablation unit coupled to the mass spectrometer.