Köln 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MS: Fachverband Massenspektrometrie
MS 9: Actinide Analysis
MS 9.2: Vortrag
Donnerstag, 13. März 2025, 18:00–18:15, HS 2 Chemie
Resonant Laser Ionisation Mass Spectrometry on hot particles from the Thule area — •Paul Hanemann1, Tobias Weissenborn1, Aaron Lehnert1, Jixin Qiao2, Sven Nilsen2, and Clemens Walther1 — 1Leibniz University Hannover, IRS — 2Technical University of Denmark
In resonant Laser-ionisation Secondary Neutral Mass Spectrometry (rL-SNMS) a set of lasers is used to selectively ionize atoms of a specific element for ToF-MS analysis. This method combines sub-micron spatial resolution with excellent elemental selectivity while keeping the sample structurally intact. In previous work [1-3], rL-SNMS was used for the characterisation of individual nuclear fuel fragments from the Chornobyl Exclusion Zone. To prove the versatility of rL-SNMS we applied this method to samples from the Thule area in Greenland, where a bomber carrying four thermonuclear bombs crashed in 1968. Individual hot particles were isolated from soil samples. In traditional SIMS analysis of Thule hot particles by Ranebo et al. [4] isobaric interferences posed a significant challenge. In this work isobaric interference free rL-SNMS measurements were performed successfully on multiple particles. The particles contain both weapons grade plutonium (240Pu/239Pu > 0.05) as well as highly enriched uranium (235U/238U > 1.0). The adaption of rL-SNMS from fragments of nuclear fuel to hot particles from nuclear weapon material shows the versatility of this method and its applications for nuclear forensics. References: 1: DOI: 10.1126/sciadv.abj1175 2: DOI: 10.1016/j.sab.2022.106377 3: DOI: 10.1016/j.jhazmat.2023.131338 4: DOI: 10.1017/S1431927607070353
Keywords: rL-SNMS; Thule; hot particle