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This paper describes the development of a method for the pre-concentration and analysis of trace-level amounts of rare-earth elements (REE) in high purity uranium (U) samples. The method comprises pre-concentration and subsequent group separation of REEs from the uranium matrix followed by their quantitative determination using inductively coupled plasma mass spectrometry. The achieved detection limit of the method (in the low pg/g range) in combination with the high chemical recovery (around 90%) enabled the investigation of REE patterns in high purity refined uranium oxides. Applying this method one could follow the REE pattern along the entire front-end of the nuclear fuel cycle.

Pre-concentration of trace levels of rare-earth elements in high purity uranium samples for nuclear forensic purposes