Abstract A method for [ 90Sr]strontium codeposition with precious metals on the cathodic substrate was examined. [ 90Sr]strontium carbonate was used as an insoluble component of the plating bath. Gold and silver were applied as matrix metals. The influence of current density, solid phase concentration and suspension ageing was determined. The particle size distribution in fresh and aged suspension was measured. From the experiments performed it follows, that up to few hundreds MBq of [ 90Sr]strontium can be fixed on 1 cm 2 of cathodic surface.