[en] The production of carrier-free Pd-103 solutions by the ¹⁰³Rh(p,n)¹⁰³Pd threshold reaction involves three chemical steps. The first deals with the electroplating of a homogeneous 40-50 μm rhodium layer on a copper target carrier, ensuring to take full benefit of the excitation function during the irradiation in a 6 deg. beam/target geometry. After irradiation the second step involves the dissolution of the irradiated rhodium, followed by step number 3, the separation of rhodium and carrier-free Pd-103. A cylindrical, graphite centrifugal electro-dissolution mini-reactor was developed. It allows time-controlled solution of rhodium fragments, powder and pieces of foils and wires. Feeding 12 N hydrochloric acid into the system operated at 85 deg. C and 1000rpm rotation speed and applying a 30 amperes ac-current, up to 3 grams of metal are dissolved in 40 ml of acid at 99% solubilization level in less than 3 hours. Carrier-free Rd 103 was separated and extracted using the solvent-solvent method. Three different solvents, aqueous Rh_2O3, Rh₂(SO₄)₃, RhCl₃, were tried for rhodium electroplating and recovery. The results indicate that aqueous Rh₂O₃ works best. To optimize the process, the experiment was repeated for different currents, temperatures, and pHs. With this method, a completely smooth, reflective, and crack-free electroplated layer with a thickness of 120 micrometers was obtained. (author)