2013 年 48 巻 4 号 p. 171-179
To estimate the effect of corrosion products on alloys for clearance inspection, the relationships between increasing corrosion weights and decreasing radiation count rates of test samples were investigated using carbon steel (SS400) and stainless steel (SUS304) contaminated by a standardized solution with the radioisotopes 241Am as an alpha emitter and 60Co as a beta emitter. The test results showed that the experimental data were nearly equal to the theoretical values. 238U is an important nuclide for uranium clearance inspection. The radiation count rate decrease caused by corrosion of 4.2 MeV alpha particles emitted by 238U was estimated taking into account the energy difference between 241Am (5.4 MeV) and 238U (4.2 MeV).
