SAMOP 2021 – wissenschaftliches Programm
SYAR 1.3: Hauptvortrag
Mittwoch, 22. September 2021, 11:45–12:15, Audimax
Pushing the Limits: Detection of Long-Lived Actinides at VERA — •Karin Hain1, Michael Kern1, Jixin Qiao2, Francesca Quinto3, Aya Sakaguchi4, Peter Steier1, Gabriele Wallner1, Andreas Wiederin1, Akihiko Yokoyama5, and Robin Golser1 — 1University of Vienna, Faculty of Physics, Austria — 2Technical University of Denmark, Denmark — 3Karlsruhe Institute of Technology, Germany — 4University of Tsukuba, Japan — 5Kanazawa University, Japan
Long-lived actinides, e.g. 236U, 237Np, 239,240Pu, 241Am can be measured largely background-free by Accelerator Mass Spectrometry (AMS) so that the minimum sample size is basically limited by the detection efficiency including chemical sample preparation, which, compared to other AMS nuclides, is rather low for actinides (around 10−4). Recent experiments at the Vienna Environmental Research Accelerator (VERA) laboratory indicate an increase of the negative ion yield of uranium by one order of magnitude by using fluoride compounds and a modified sample preparation. In combination with previous modifications to the setup and measurement procedure, this will result in an increase of detection efficiency by almost a factor 100. This improvement is especially important for the analysis of the 233U/236U ratio which has the potential to become a novel sensitive fingerprint for releases from nuclear industry. This talk will give an overview of the recent improvements in actinide detection at VERA and of on-going projects like the production of an isotopic Np spike or on the respective applications, like the retrospective analysis of actinides in lungs or on aerosols.