The small sized tube has been widely applied in boilers and its detection is becoming more and more important.However

nowadays the filming operation of the small sized tube is non-standard and careless

thereby wasting a lot of photographic plate.The thesis mainly introduces radiographic testing of the small sized tube

the transillumination method of the elliptical imaging and evaluation of the photographic plate.Several problems have also been illustrated in the thesis which is worth our attention while doing radiographic inspection.They can efficiently examine the defects of the small sized tube and guarantee the quality up to the standard.