We have developed portable X-band (9.3 GHz) 950 keV/3.95 MeV linac X-ray sources. We are applying the 950 keV system for nondestructive testing testing of industrial and societal infrastructures such as reaction tower, pier and bridge (thinner than 400 mm). Not only the inner structure, but also dynamic image of the inner fluid can be obtained. We have joined the benchmark test for cut samples of a real bridge with other NDT methods hosted by National Institute of Land and Infrastructure Management. We have successfully performed 3.95 MeV electron linac X-ray inspection of bridge sample at Public Works Research Institute for the first time in Japan. We use flat-panel X-ray camera, imaging plate, partial angle CT and Tomosynthesis so that iron-wires of 7 mm diameter can be reconstructed with 1 mm spatial resolution.
