EXTRACTION CHROMATOGRAPHIC-SEPARATION OF CARRIER-FREE Y-90 FROM SR-90Y-90 GENERATOR BY CROWN-ETHER COATED SILICA-GELS/

A remarkable extraction chromatographic method for the preparation of Y-90 of high radiochemical purity has been developed. The generator co nsists of silica gel coated crown ether. It functions as a strong adso rber for Sr-90 and in the meantime high purity of Y-90 is eluted with a dilute solution of picric acid after a suitable period. The experime nts indicated that DC18C6 coated silica gel is better than that of DB1 8C6 coated. The extraction capacity of strontium on 3.8% DC18C6 coated silica gel is 5.6 mg Sr/g silica gel. Yttrium is obtained with more t han 95% milking yield with radionuclide purity greater than 99.9%. The extraction chromatographic generator does not change its characterist ics even after 5 elutions.