Measurement of contamination and decontamination properties of protective surfaces at nuclear power plants

A method was developed for objective assessment of suitability of protective coatings for surfaces in nuclear power plants with respect to their consisting in standard contamination of the tested surface with isotope In-113m and its decontamination using an agreed upon method. A GAMMA scintillation system from Hungary is used for activity counting. The decontamination solution consists of 20 g oxalic acid, 20 g amonium oxalate, 10 ml nitric acid, 10 ml phosphoric acid, 20 ml of a detergent, and distilled water to complete 1 litre. The results of the measurement are processed using a Varian 620/L computer. (Z.M.)