Characteristics of radionuclide distribution on the melting conditions, flux types, and kinds of radionuclide were investigated in an electric arc furnace. The results of the radionuclide partitioning in the oxidation conditions showed a similar trend with the results in the inert gas conditions. In contrast to the removal of the cobalt in the melting decontamination of the steel wastes, it was easily removed to the slag phase in the aluminum melting process.