Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 3: Resonance Ionization MS and others
MS 3.1: Hauptvortrag
Dienstag, 7. März 2017, 11:00–11:30, RW 2
Resonant Laser-SNMS on actinides for spatially resolved ultra-trace analysis — •Clemens Walther1, Hauke Bosco1, Linda Hamann1, Michael Franzmann2, and Klaus Wendt2 — 1Institute for Radioecology and Radiation Protection, Leibniz-Universität Hannover, Herrenhäuser Straße 2, D-30419 Hannover, Germany — 2Institute of Physics, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55128 Mainz, Germany
After accidental release of radionuclides into the environments, fast and highly sensitive detection methods are required. The new resonant Laser-SNMS system at the IRS Hannover was developed to cover those specifications by combining the high element selectivity of resonance ionization with the non-destructive analysis of a static TOF-SIMS with spatial resolution down to 70 nm. The laser-ionization of a neutral particle cloud above the sample required a simulation of the expanding particles and a simulation based optimization of the TOF analyzer due to different ionization behavior. First mass spectra of synthetical uranium and plutonium samples demonstrated the expected suppression of interfering elements and molecules, which was confirmed with environmental samples. In MOX fuel Pu-238 and U-238 were successfully discriminated. It was possible to create isotope selective images of environmental sample material. We present first resonant Laser SNMS Measurements on Pu, Sr and U containing samples. First results on particles from the Chernobyl exclusion zone and from the evacuated zone close to the Fukushima Daichii nuclear power plant are presented.