Group hexavalent actinide separation from lanthanides using sodium bismuthate chromatography.

Advanced used nuclear fuel (UNF) reprocessing strategies are limited by the complex radiochemical separations and engineering required to achieve the separation of actinides (An) from neutron scavenging lanthanides (Ln). The accessibility of the hexavalent oxidation state for the actinides (U - Am) provides a pathway to achieving a group hexavalent actinide separation from the trivalent lanthanides and Cm. The solid oxidant and ion exchanger, sodium bismuthate (NaBiO), has been demonstrated to quantitatively oxidize and separate Am from trivalent Cm in a column chromatographic system.

Recent developments in the synthetic chemistry of technetium disulfide.

Technetium disulfide was prepared by reaction between the elements in a sealed tube at 450 °C, by reaction between Tc2(O2CCH3)5 and H2S gas in a flowing system at 450 °C and by reaction between K2TcCl6 and H2S gas in sulfuric acid. The samples were analysed by X-ray absorption fine structure (XAFS) spectroscopy.