SAMOP 2021 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Accelerator Mass Spectrometry I
MS 7.4: Vortrag
Donnerstag, 23. September 2021, 11:45–12:00, H3
Measurements of volatile radioactive isotopes in reactor graphite — •Timm-Florian Pabst1, Gereon Hackenberg1, Stefan Heinze1, Susan Herb1, Yannik Jacobi1, Markus Schiffer1, Alexander Stolz1, Erik Strub2, and Alfred Dewald1 — 1Institute for Nuclear Physics, University of Cologne, Germany — 2Department of Chemistry, University of Cologne, Germany
Activated graphite, e.g. from graphite moderated reactors, contains several radioactive nuclides like 14C, 36Cl, or 3H. For the final disposal of such material a quantitative characterization is demanded.
We are aiming for a system which enables automated measurements using the AMS technique with gaseous samples, for 14C, 36Cl, and 3H, The planned system should provide a high sample throughput as well as the possibility of sample dilution in cases of high activity. Therefore a new gas-interface was built which uses two syringes for the transport of the sample gas into the ion source and a separate reservoir for blank gas which can be used for the dilution.
For the measurement of the tritium concentration, we expanded our ion source test bench. A 100 kV accelerator stage with a carbon stripper foil in the centre was installed along with an additional 90∘ analysing magnet and a silicon detector. This will allow efficient and accurate characterisation of the activity in reactor graphite material, which is foreseen be stored in repositories like e.g. the mine Konrad where activity limits have to be considered. In this contribution we will present the layout of our systems as well as its present status.
Supported by BMBF under contract number 15S9410B.