Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 14: Accelerator Mass Spectrometry and Applications 4

MS 14.3: Vortrag

Freitag, 27. März 2015, 11:45–12:00, PH/HS2

Determination of plutonium and uranium in environmental samples from Fukushima — •Stephanie Schneider¹, Marcus Christl², Georg Steinhauser³, and Clemens Walther¹ — ¹Institut für Radioökologie und Strahlenschutz, Leibniz Universität Hannover, Hannover — ²Laboratory of Ion Beam Physics, ETH Zürich, Switzerland — ³Department of Environmental and Radiological Health Sciences, Colorado State University, United States of America

During the Fukushima accident significant amounts of radioactive nuclides were released into the atmosphere, including small amounts of actinides. Previous investigations showed a strong localization of plutonium, which indicates a particulate release of this element from the NPP. As plutonium is of a high radiological relevance if incorporated, further investigations on vegetation, litter and soil samples taken at 8 different sampling sites in the vicinity of the damaged reactor were conducted. Accelerator mass spectrometry is a powerful tool to determine even lowest concentrations. For these measurements the samples were first leached and then uranium and plutonium were chemically separated using extraction chromatography. Here we use the ²³⁶U/²³⁸U and the ²⁴⁰Pu/²³⁹Pu isotopic ratios as indicators to distinguish between global fallout and releases from a nuclear reactor.