Anion exchange separation of Ga-In on Dowex 1 resins of 2, 4, 8, and 10 nominal cross-linkings, respectively, was investigated at tracer loadings. The influence of temperature on the exchange reaction was also studied on the different resins. Separation factors, plate heights, and resolutions for the two peaks were calculated from the elution curves. Best separations were achieved with Dowex 1X4 due to the most promising values for both plate height and resolution. It was also found that the separation factors as well as the plate heights decreased with growing temperature.