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The separation of no-carrier-added (n.c.a.) radiobromine and radiogallium from an irradiated ZnSe target was developed using anion-exchange chromatography. The adsorption behaviour of n.c.a. radiobromine, n.c.a. radiogallium, and macro amounts of zinc and selenium towards the anion-exchange resin Dowex 1 × 10, in Cl −  and OH −  form, was investigated. Radiobromide was strongly adsorbed on the resin at a low KOH concentration, while n.c.a. radiogallium, zinc and selenium were weakly adsorbed. The adsorbed n.c.a. radiobromine was recovered by 0.2 M H 2 SO 4 , followed by addition of KOH, evaporation and redissolution of residue. Finally a K ∗  Br solution was obtained containing about 93 ± 3% of the n.c.a. radiobromine loaded onto the column. The chloride strength in the residual solution (containing n.c.a. radiogallium and macro amounts of zinc and selenium) was increased to 4 M and then loaded onto the Dowex 1 × 10 column in Cl −  form. Radiogallium (n.c.a.) was adsorbed while zinc and selenium were not. About 94 ± 2% of the n.c.a. radiogallium loaded on the column was then eluted with 0.1 M HCl. Using this method  76,77 Br and  66,67 Ga could be obtained in high purity. The radionuclidic purity of the  66 Ga/ 67 Ga theragnostic pair is high enough for use in medicine. In the case of the  76 Br/ 77 Br pair, however, highly enriched  76 Se and  77 Se would be needed as target materials, in order to achieve the required radionuclidic purity.

Radiochemical separation of 76,77 Br and 66,67 Ga from irradiated ZnSe targets using anion-exchange chromatography