Speaker
Summary
An extraction chromatography column-based separation method using TEVA (TetraValent Actinides), UTEVA (Uranium and TetraValent Actinides), and RE (Rare Earth) resins (Figure 1) is being developed to separate a variety of radionuclides resulting from uranium fission. Following dissolution of a bulk uranium sample via a microwave dissolution method, a single load solution matrix is used to load three columns in tandem, simplifying previous separation processes by avoiding evaporation and reconstitution steps. Several species of interest, such as key actinide, are retained on the resins during loading, while many fission products such as isotopes of Ru, Ba, Zr, and Nb have been shown to pass through the resins on loading. The resins are then separated to selectively elute several elements of interest such as U, Th, Pu, Np, and Am/Cm/lanthanides. High recovery yields (>90%) have been measured for many actinides, lanthanides, and other fission products through these separation methods. Progress will be presented toward a more complete separation of Pu and Np through selective reduction on a TEVA resin as well as actinides separations that may be possible through development of a more complex RE resin separation.
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