PURPOSE: To inhibit corrosion of a metallic device or apparatus, while eliminating or suppressing the activity of metal-corrosion microbes in water with a simplified means, by irradiating the water, in which the metal-corrosive microbes grow, accommodated in the metallic device or apparatus with γ-rays.
CONSTITUTION: A sealed γ-ray source part 6 is provided at the down stream side of a circulating pump 2 but at the upper stream side of a cooler 3, and a Co- 60 ray source entirely covered with plastics is arranged in the γ-ray source part 6. As cooling water, desalinated water prepared by passing river water through an ion-exchange resin column is used. Sodium nitrite is added to the water so that initial nitrite ion concentration will be at 2,000ppm. By irradiation with γ-rays from the sealed γ-ray source part 6, the activity of nitrobacterium can be esily eliminated or suppressed, so that corrosion of a metallic device or apparatus can be inhibited.
KASHIMURA EIJI
MINATO AKIRA
SHIMIZU NORIO
OOSUMI KATSUMI
