Abstract: A method for dissolving radioactively contaminated surfaces of metal articles using a reagent of HBF.sub.4 acid with the addition of at least one oxidation agent, preferably hydrogen peroxide H.sub.2 O.sub.2, for the efficient decontamination of radioactively contaminated metal articles. An optimum mixture of this reagent was about 5% HBF.sub.4 acid with the addition of about 0.5% by volume of H.sub.2 O.sub.2. Radioactively contaminated lead plates, for example, were treated by this reagent, and the contaminated solution was used as an electrolyte without any further additive. The contaminated lead or lead oxide is deposited at the anode or cathode decontaminating the solution which may be returned to the process. If, instead of lead, the metal is copper, nickel, steel, silver or mercury or their alloys, the method for dissolving radioactively contaminated surfaces can be executed in the same way with the same reagent.