Abstract
JRC-Karlsruhe obtained a swipe sample from a highly enriched uranium seizure, which had taken place in 2011. Due to the very low amount of uranium (nanograms) a new method needed to be developed to determine the U production date (age). The particles on the swipe were collected on a pyrolytic graphite planchet using a vacuum impactor and they were subsequently leached with ccHNO3. The “bulk” U isotopic composition (235U: 72.51 ± 0.03 wt%) and the production date (December 1992 ± 1 year) determined by MC-ICP-MS indicated that the material showed similarity with two other HEU cases seized earlier in Europe.
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Varga, Z., Wallenius, M., Nicholl, A., Mayer, K., Balan, I., & Benea, V. (2019). Measurement of production date (age) of nanogram amount of uranium. Journal of Radioanalytical and Nuclear Chemistry, 322(3), 1585–1591. https://doi.org/10.1007/s10967-019-06705-4
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