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MS: Fachverband Massenspektrometrie
MS 3: Actinide Analysis
MS 3.5: Vortrag
Dienstag, 3. März 2026, 12:30–12:45, N 6
Assessment of the behaviour and source of anthropogenic actinides on HZDR’s research campus — •Shruti Dabke1, Sebastian Fichter1, Dominik Koll1, Michael Hotchkis2, and Anton Wallner1 — 1Helmholtz-Zentrum Dresden Rossendorf (HZDR), Dresden, Germany — 2Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, Australia
Understanding actinide behaviour in environmental reservoirs is essential for assessing safety and potential plant or groundwater uptake. To study the accessibility of actinides by different chemical conditions, a sequential leaching technique was employed. Hence, the fractionation of actinides, specifically U, Pu and Am, in one soil sample collected from the campus of HZDR was analysed for five established fractions and an additional refractory fraction accessed by HF digestion. The concentrations of the actinide isotopes were measured using ICP-MS and AMS. Preliminary Pu data showed a non-negligible percentage of the total plutonium concentration in the refractory fraction. Acid leaching, which is commonly used for such environmental analyses, would not typically give access to this refractory plutonium. Moreover, the ratio of 240Pu/239Pu in the refractory fraction was determined to be 0.047 ± 0.002 which is significantly lower than the global fallout ratio found in the other fractions. This suggests a source of refractory weapons-grade plutonium. Further experiments on soil samples and the IAEA-385 reference sediment will focus on the refractory fraction, and the results of isotopic fractionation of the other actinide elements will be studied using the new AMS facility, HAMSTER, at HZDR.
Keywords: sequential leaching; accelerator mass spectrometry; actinides