Application of high-energy photon beam to industrial imaging based on positron annihilation

Toyokawa, Hiroyuki*; Hirade, Tetsuya  ; Kuroda, Ryunosuke*; Suzuki, Ryoichi*; Odaira, Toshiyuki*

A novel radiographic method for nondestructive testing of industrial products based on positron annihilation was presented. High-energy -ray beam, which was generated via the laser-Compton scattering was used for the present method. An experimental study using a reinforced concrete block, as a sample, showed that the method was suitable for nondestructive testing of industrial products containing metals. Tomographic method was also applied, and a cross-sectional image of the sample was obtained. By use of high-energy -ray beam, we can detect not only the decay of -ray beam and also the decay of annihilation -rays from positrons formed in the samples. By shifting and rotating the sample, it is possible to obtain PET (positron emission tomography) image. It is also expected that positron annihilation method can be applied for the certain cite in the sample.