Patent ID: 6998052

Claim:
A method for producing a solution of desired daughter radionuclide that is substantially free of impurities comprising the steps of: (a) contacting an aqueous parent-daughter solution containing a desired daughter radionuclide with a first separation medium having a high affinity for the desired daughter radionuclide and a low affinity for the parent and other daughter radionuclides, said desired daughter and parent radionuclides having different (i) ionic charges, (ii) charge densities or (iii) both as they are present in said solution, and maintaining that contact for a time period sufficient for said desired daughter radionuclide to be bound by the first separation medium to form desired daughter-laden separation medium and a desired daughter-depleted parent-daughter solution; (b) removing the desired daughter-depleted parent daughter solution from the separation medium; (c) stripping the desired daughter radionuclide from the desired daughter-laden separation medium to form a solution of desired daughter radionuclide; (e) contacting the solution of desired daughter radionuclide with a second separation medium having a high affinity for the parent radionuclide and a low affinity for said desired daughter radionuclide, and maintaining that contact for a time period sufficient for said parent radionuclide to be bound by the second separation medium to form a solution of substantially impurity-tree desired daughter radionuclide.