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Erlangen 2018 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry 3

MS 8.1: Talk

Thursday, March 8, 2018, 14:30–14:45, R 1.020

Recent applications and developments of actinide detection at VERA — •Karin Hain1, Peter Steier1, Robin Golser1, Jixin Qiao2, Gabrielle Wallner3, Stephan Winkler4, and Philipp Zima31Faculty of Physics, University of Vienna, Austria — 2Technical University of Denmark, Denmark — 3Faculty of Chemistry, University of Vienna, Austria — 4iThemba LABS, Johannesburg, South Africa

Long-lived actinides like 239,240Pu, 241Am and in particular 236U are routinely analyzed in environmental samples at the Vienna Environmental Research Accelerator (VERA). The aim is to understand the migration of these elements by studying their distribution in the environment and also biosphere, and their emission sources. In this context, for example, depth profiles of these nuclides and 237Np in the Pacific Ocean and the 236U concentration in human lungs ashes were studied. Most recently our portfolio was extended by anthropogenic 233U which can be found in global fallout at around 1 % of 236U on the Northern Hemisphere where it seems to offer the opportunity to discriminate between U releases from thermonuclear weapons and civil nuclear industry. First measurements on corals and snow from Antarctica, however, indicate a considerably lower 233U/236U ratio on the Southern Hemisphere. Current developments mainly focus on the increase of the negative ion yield of actinides from the sputter ion source by using fluoride based targets and to simplify sample preparation by detecting 236U directly from the soil matrix. The results of the mentioned applications and developments will be discussed in this talk.

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