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Measurement of production date (age) of nanogram amount of uranium |
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| Authors: | Varga Zsolt Wallenius Maria Nicholl Adrian Mayer Klaus Balan Ionel Benea Vasile |
| Affiliation: | 1.European Commission, Joint Research Centre (JRC), Karlsruhe, Germany ;2.National Agency for Regulation of Nuclear and Radiological Activities, 1 A. Russo Street, 2068, Chi?in?u, Republic of Moldova ; |
| 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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