Today, the application of scientific achievements in the nuclear field are widely used in industries identified concrete thick steel fabrication, pipe scan ... etc. There are many researchers have developed methods and models to identify defects, the thickness of metal corrosion. However, we need a method or technique that can quickly and accurately identify high this change. In this work the author applications peak to valley approach comparable sensitivity in determining the thickness of the material with the transmission method with 137Cs source. Peak to valley method for detection results change the thickness of the material faster than the transmission method
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