Erlangen 2022 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: Mass Spectrometry Methods

MS 2.3: Vortrag

Montag, 14. März 2022, 17:15–17:30, MS-H9

Production and characterization of standard particles for rL-SNMS calibration — Stefan Bister, •Paul Hanemann, Manuel Raiwa, Sandra Reinhard, Darcy van Eerten, and Clemens Walther — Institute of Radioecology and Radiation Protection, Leibniz University Hannover

Resonant laser secondary neutral mass spectrometry (rL-SNMS) is a non-destructive method that combines high sensitivity and resolution of ToF-SIMS with high element selectivity of resonant laser ionisation. One main application is the determination of isotope ratios on individual micro particles of spent nuclear fuel from the Chernobyl exclusion zone (CEZ). Standard materials are needed for dealing with isobaric interferences such as 238U and 238Pu as well as differences in the laser ionisation and sputter efficiencies for different elements and isotopes. This work produced particles via Fe-coprecipitation to achieve homogeneous U and Pu bearing particles. Isotopes with different mass numbers were used to determine relative ionisation efficiencies without isobaric interferences. The homogeneity of U and Pu in the particles was confirmed by ToF-SIMS and EDX measurements. On several particles Pu-resonant measurement were performed to investigate the suppression of non-resonant U. It was shown that the suppression is high enough to be able to detect 238Pu in a particle with a 1E5 higher 238U content, as found in "hot particles" from the CEZ. RL-SNMS measurements of produced particles containing only different U isotopes allowed the investigation of isotope effects in the resonant laser ionisation.