Y.Yano,P.Chu,T.F.Budinger,P.M.Grant,A.E.Ogard,J.W.Barnes,

Strontium-82, produced by spallation reaction with medium-energy pro ton beams, was used to evaluate Bio-Rex 70 and Chelex-100 ion-exchange resins for use in a compact Rb-82 generator. Adsorption of Sr-82 to the resin column, Rb-82 elution yields, Sr breakthrough, and 8tRb—Sr separa tion factors were determined for newly prepared columns and for long term elution conditions. Separation factors of jØ7 to JØ8were obtained with 2 % NaCl elutions from Bio-Rex 70 resin columns while the separation factor was about S X 1O@with the Chelex-100 resin column. J NuciMed18: 46—50,1977 Recent improvements in positron cameras and the development of ring detectors for traverse-section positron tomography (1—6) have created renewed interest in positron-emitter generators such a