Redistribution des isotopes de l’uranium et du plutonium présents à l’état d’ultra-traces dans les sédiments des fleuves côtiers drainant le panache radioactif de Fukushima

Abstract : The 2011 Fukushima Dai-ichi accident led to the deposition of uranium and plutonium at ultra-trace levels on coastal catchments in northeastern Japan, in addition to the natural uranium and plutonium from the global fallout of the atmospheric nuclear tests, already present before the accident. The relative contribution of these different sources can be quantified from the precise measurement of their isotopic composition and the precise determination of local isotopic signatures prior to the accident through the compilation of literature data and the analysis of a sediment core collected in a dam reservoir. Furthermore, the analysis of soil samples collected after 2011 shows that the spatial distribution of initial plutonium deposits is roughly similar to that of radiocaesium. In addition, if the presence of uranium originating from the plant was not confirmed, the plutonium rejected by the accident was identified and quantified in all the river sediment samples analyzed, showing that the plutonium originating from the plant is more quickly exported to the Pacific Ocean than that originating from the global atmospheric tests. In addition, plutonium bearing micro particles were localized and then precisely characterized (size, morphology, chemical composition). Overall, this work provided original data on the fate of actinides in the Fukushima environment.
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Hugo Jaegler. Redistribution des isotopes de l’uranium et du plutonium présents à l’état d’ultra-traces dans les sédiments des fleuves côtiers drainant le panache radioactif de Fukushima. Géochimie. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLS288⟩. ⟨tel-02303049v2⟩

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