Gamma irradiation effects on Eu(III) uptake by HDEHP-functionalized support materials

Four chromatographic supports were functionalized with bis-(2-ethylhexyl) phosphoric acid (HDEHP) and examined for radiation stability when used for f-element separations after exposure to high levels of ionizing gamma radiation. Changes in Eu(III) partitioning were evaluated and compared to an analogous solvent extraction system using HDEHP in n-dodecane. The solvent extraction system showed an increase in Eu(III) uptake with increasing γ irradiation dose to the solvent in the presence of nitric acid. The Eu(III) distribution profiles indicate that the functionalized chromatographic support materials are less affected by γ irradiation, when exposed in a radiation environment of up to 2.5 MGy in the presence of nitric acid.