DEVELOPMENT OF METHOD FOR THE PREPARATION OF HIGHLY PURIFIED Y-90

摘要

The extraction of Y3+ from Sr2+ has been carried out with a new type of extractant, sym-dibenzo-16-crown-5-oxyacetic acid, in chloroform using Sr-87m and Y-90m as tracers. The extraction efficiency of Y3+ depends strongly on the pH of aqueous phase, whereas the extraction of Sr2+ is negligible at pH < 6.5. The dependence of the concentration of sym-dibenzo-16-crown-5-oxyacetic acid on the distribution ratio of Y3+ is linear and has a slope of about 2. This suggests that Y3+ appears to form a 1:2 complex with ligand. The new method for preparing highly purified Y-90 by solvent extraction from equilibrium Sr-90-Y-90 has been developed. The radionuclide purity of Y-90 obtained is estimated to be 10(-8) and the recovery rate of Y-90 is about 99%. (C) 1995 Academic Press, Inc. [References: 10]