Isolation of Medicine-Applicable Actinium-225 from Thorium Targets Irradiated by Medium-Energy Protons

Extraction chromatographic behavior of actinium and REE on DGA, Ln and TRU resins in nitric acid solutions

“…In Fig. 3 the results of La(III) and Ce(III) sorption on DGA Resin from the present work as soon as Ac(III) capacity factor on DGA Resin from our previously work [18] are presented. The capacity factor for Ac(III) on TRU Resin is less dependent on the concentration of nitric acid compared with Ln Resin.…”

“…Determination of Th-sorption capacity Separation of bulk Th(IV) by liquid-liquid extraction was described in details in [18]. It is possible to remove more than 99.9 % of thorium in a single extraction step.…”

“…The head stage of target processing is the dissolution of irradiated metallic thorium that was performed using 100 ml of 6 M HNO 3 with the addition of catalytic amounts of HF (4.0 9 10 -3 M). Afterwards the main quantity of thorium was removed by two sequential liquidliquid extractions by the equal volumes of di(2-ethylhexyl)orthophosphoric acid in toluene (1:1 by volume) which was pre-conditioned with 6 M HNO 3 as described in [18]. The liquid extraction was found to be an effective separation method to remove quantitatively the large amount of thorium.…”

“…This could be used for group separation of Ac(III) and trivalent isotopes from isotopes of Cs, Ra, Ba, Ru, Nb, etc. Ac(III)/REE(III) may be eluted by DGA Resin in 0.01-0.05 M HNO 3 [18]. So the task is the separation of actinium and its analogues.…”

“…The k 0 values on Ln Resin demonstrate inverse acidity dependence [15]. Earlier the k 0 for actinium(III) on Ln Resin was measured in the range of 0.08-0.2 M HNO 3 [15] and on DGA Resin in the range of 0.01-10 M [18,20]. The capacity factor for Ln Resin is decreasing from *10 2 to 2 in the presented range, DGA Resin is from *5 to 10 3 in presented range.…”