Decontamination method for radioactive wastes

The present invention provides a method of processing radioactive halide wastes, in which alkali metal elements in radioactive halide wastes can be decontaminated and the operations thereof can be conduced at about room temperature. Namely, halides are dissolved in a solvent such as water. Subsequently, the solution is evaporated under vacuum or cooled to a level where LiCl and KCl which occupy the most of the radioactive wastes are saturated, and other radioactive elements do not reach their saturation solubility. Then, the LiCl and KCl are precipitated, and the precipitations can be separated and recovered. Halide wastes can thus be decontaminated, and the recovered LiCl and KCl can be used again. When the halogenated wastes are dissolved in water, rare earth elements and actinide elements in the wastes can be separated and recovered as precipitation of oxides previously. (I.S.)