Erlangen 2018 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Poster 1

MS 9.3: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Redoutensaal

Improving the accuracy in the analysis of 99Tc using AMS — •Christoph Busser¹, Thomas Faestermann¹, José Manuel Gómez-Guzmán¹, Karin Hain², Angelina Kinast¹, Dominik Koll¹, Gunther Korschinek¹, Florian Kortmann³, David Krieg¹, Manuel Lebert¹, Christoph Lierse v. Gostomski³, Peter Ludwig¹, and Francesca Quinto⁴ — ¹Physics Department, Technical University of Munich, Garching — ²Isotope Research and Nuclear Physics, University of Vienna, Vienna — ³Radio Chemistry Munich, Technical University of Munich, Garching — ⁴Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Karlsruhe

Significant amounts of Tc-97 are released in to the environment by nuclear bomb tests, nuclear reprocessing plants, nuclear accidents and nuclear medicine. Further, as a fission product, Tc-99 is a concern for the storage of spent nuclear fuel concerning the high mobility of the pertechnetate ion. Hence quantitative ultra trace analysis of it is of great importance. However the lack of stable Tc isotopes hampers the measurements by AMS. Our approach to overcome this obstacle is to utilize the long lived isotope Tc-97. Therefore we have produced Tc-97 in two ways, by Ru-96(n,γ)Ru-97 -> Tc-97 in our research reactor FRMII and by the nuclear reaction of Li-7 with Nb-93 at our tandem accelerator. An important issue is the proceeding sample chemistry to suppress Mo-97 and Ru-99 to achieve low backgrounds for the AMS measurements. In this presentation we will report on the nuclide production, our sample chemistry and details of the first AMS measurement.