Development of an accelerator for X-ray inspection apparatus with high clairvoyance

At present, there is no portable X-ray generator usable for non-destructive inspection of thick concretes used for bridges, and so on. To enable on non-destructive inspection of such thick concrete materials with more than 300 mm in thickness, authors developed a new small size accelerator with same acceleration principle as that of betatron. And, the authors also developed two types of new induction accelerators such as 'spiral orbit type' and 'cylindrical type'. Furthermore, development of a detector with excellent sensitivity to X-ray with wavelength suitable for inspection and software for image processing are planned. Here was described acceleration principles of new accelerators, test results on prototypes of the accelerators, and development states on field emission array considering new electron gun alternating thermal one and cold cathode type electron gun using carbon nano-tubes. (G.K.)