Drawing and Application of Exposure Curve of Co60 γ Ray for Pre-service and In-service Inspection for Nuclear Power Plant

This paper aims to draw Co60 γ ray exposure curve and Co60 γ formula by using pre-service inspection (PSI) and in-service inspection (ISI) for nuclear power plant samples. The drawbacks of exposure curve formula and the exposure curve calculation ruler were analyzed, and lots of 40~130 mm thickness steel samples together with Co60 γ ray, Kodak M industrial film and lead filter were experimentally tested. Co60 γ ray exposure curve and its formula provide basis for completion of PSI and ISI, and they also boost the creditability of ray check result.