Patent Number: 055704689
Section: claims

1. A method of decontaminating substances contaminated with radioactivity, comprising the steps of: decontaminating a substance contaminated with radioactivity by using a chelate liquid, removing the chelate liquid from the contaminated substance, drying and heating the contaminated substance by hot air at a temperature not lower than the boiling point of a solvent, adding said solvent to the contaminated substance to rapidly vaporize the solvent so as to separate any remaining chelate liquid, which has been adhering to the contaminated substance, from the contaminated substance, and removing the thus separated chelate liquid from the contaminated substance along with said solvent. 2. A method of decontaminating substances contaminated with radioactivity according to claim 1, wherein said solvent is methylene chloride. 3. A method of decontaminating substances contaminated with radioactivity according to claim 1 or 2, wherein said substance contaminated with radioactivity is shot blasting grit.