Development of a linac CT scanner for defect imaging in steel piping

The authors report on the development of a linac CT scanner for pipe inspection. The scanner is equipped with a small sized 0.95 MeV linac as a highly penetrable x-ray source, and 30 channel compact solid-state detector units (CdWO4 scintillator + photodiode). A precise scanning system is realized on the basis of a new scanning method, scanner rotating sector scan. This system can be easily disassembled for setting the scanner itself onto fixed piping. A tomogram of steel piping up to 300A Sch40 can be reconstructed within an hour. A 0.1 mm wide slit was clearly visualized