Sorption of actinides, particularly plutonium, onto submicrometer-sized colloids increases their mobility, but these plutonium colloids are difficult to detect in the far-field. We identified actinides on colloids in the groundwater from the Mayak Production Association, Urals, Russia; at the source, the plutonium activity is approximately 1000 becquerels per liter. Plutonium activities are sti...

As innovative means to recover actinides from irradiated fuels, pyrochemical processes are proposed. In the Japan Atomic Energy Research Institute (JAERI), the feasibility of applying molten-salts processes to nitride fuels containing transuranium elements for transmutation is investigated. In the course of study, experiments and analyses have been made on the high-temperature chemistry of M–N–...

The application of quantum chemistry to systems containing atoms of the lanthanide (57La 71Lu) and/or actinide (90Th 103Lr) series is a considerable challenge and has been attempted only by a comparatively small number of researchers. Several complications, some of which will be described in the following, prevent standard quantum chemical approaches from being successful in this field in all r...

PNC has been promoting actinides partitioning studies as a part of advanced reprocessing system development efforts since 1990. Concurrently, the general TRUEX process was investigated as a reference partitioning tool. A concentrated high level liquid waste (llLLW) from LWR fuel reprocessing and a highly active raffinate (HAR) from FBR spent fuel PUREX experiments were nominated as target waste...

In-vivo measurements of actinides are carried out in the CIEMAT Whole Body Counting facility, using a Low Energy germanium detection system (LE Ge) to evaluate the Activity of Am in lungs and skeleton. The sensitivity of the LE Ge detection system in the assessment of the Americium retained in the body is associated to the Minimum Detectable Activity (MDA) estimated in the different available i...

Recent advances (during the 2007-2014 period) in the coordination and organometallic chemistry of compounds containing natural and artificially prepared radionuclides (actinides and technetium), are reviewed. Radioactive isotopes of naturally stable elements are not included for discussion in this work. Actinide and technetium complexes with O-, N-, N,O, N,S-, P-containing ligands, as well π-or...

Dissolution of UO2, U3O8, and solid solutions of actinides in UO2 in subacid aqueous solutions (pH 0.9-1.4) of Fe(III) nitrate was studied. Complete dissolution of the oxides is attained at a molar ratio of ferric nitrate to uranium of 1.6. During this process actinides pass into the solution in the form of U(VI), Np(V), Pu(III), and Am(III). In the solutions obtained U(VI) is stable both at ro...