Search Results

You are looking at 1 - 10 of 6,870 items :

Clear All

Radiochim. Acta 95, 559–567 (2007) / DOI 10.1524/ract.2007.95.10.559 © by Oldenbourg Wissenschaftsverlag, München Kinetics and mechanism of the plutonium catalysed nitric acid oxidation of U(IV) ions in 30% tributyl phosphate solution By V. S. Koltunov1, G. I. Zhuravleva1, V. I. Marchenko1, K. N. Dvoeglazov1, O. A. Savilova1, G. V. Koltunov1, R. J. Taylor2,∗ and M. Bankhead3 1 A. A. Bochvar All-Russia Institute of Inorganic Materials, VNIINM, PO Box 369, Moscow 123060, Russia 2 Nexia Solutions Ltd., British Technology Centre, Seascale, CA20 1PG, UK 3 Nexia

A Fundamental Study on Uranium Isotope Separation Using U(IV)—U(VI) Electron Exchange Reaction Junji Fukuda, Yasuhiko Fujii, and Makoto Okamoto* Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Ookayama, Meguro-Ku, Tokyo 152 (Japan) Z. Naturforsch. 38a, 1072- 1077 (1983); received June 21, 1983 Displacement chromatography of electron-exchange reaction between U(IV) and U(VI) has been accomplished in an anion exchange resin column using Ti(III) ion as a reductant and Fe(III) ion as an oxidant. The details of the so-called redox

ratios of 234U, 235U, 236U and 238U were determined by mass spectrometry on uranium samples obtained from a chromatographic uranium enrichment process based on the U(IV) — U(VI) chemical exchange reaction. According to standard theory, the elementary isotope effect in processes based on equilibrium chemical exchange is proportional to the mass difference of the isotopes. In the present work this has been confirmed for 234U, 236U and 238U. However, according to the observed data the fractionation between 234U and 235U is much smaller than the one between 235U and