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Abstract  

Widely present in the mixed wastes at the Hanford site, ethylenediametetraaceticacid (EDTA) can solubilize radionuclides such as plutonium and may increasetheir mobility in the environment. We have evaluated the sorption of Pu(IV)onto Hanford soil in the presence and in the absence of EDTA through laboratory-basedexperiments at ambient temperature and atmosphere. The sorption ratio (R%)was determined as a function of EDTA concentration and solid-liquid ratio.The sorption decreased significantly when EDTA concentration increased. Thediffusion of Pu(IV)–EDTA was relatively fast, with an effective diffusioncoefficient, D e = 3.54 . 10 –6 cm 2 /s at pH 5.25.

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Journal of Radioanalytical and Nuclear Chemistry
Authors: B. Wierczinski, K. Gregorich, B. Kadkhodayan, D. Lee, L. Beauvais, M. Hendricks, C. Kacher, M. Lane, D. Keeney-Shaughnessy, N. Stoyer, D. Strellis, E. Sylwester, P. Wilk, D. Hoffman, R. Malmbeck, G. Skarnemark, J. Alstad, J. Omtvedt, K. Eberhardt, M. Mendel, A. Nähler, and N. Trautmann

Abstract  

Subsecond 224 Pa (T 1/2 = 0.85 s) was produced via the 209 Bi(18 O,3n)224 Pa reaction at the 88 inch cyclotron at the Lawrence Berkeley National Laboratory. After production it was transported via a gas-jet system to the centrifuge system SISAK 3. Following on-line extraction with trioctylamine/scintillation solutions from 1M lactic acid, 224 Pa was detected applying on-line -liquid scintillation counting. Unambiguous identification was achieved using time-correlated --decay chain analysis. This constitutes the first chemical on-line separation and detection of a subsecond -decaying nuclide, 0.85-s 224 Pa with the fast extraction system SISAK 3.

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