| Abstract: | A gamma ray computed tomography (ψ-ray CT) system has been developed for applications to large specimens of high density materials.The system features a wide fan beam of ψ-rays, extendable up to 20 degrees, 20 channel ψ-ray scintillation detectors using bismuth germanate oxide with a counting rate being up to 105 per second for reducing the mechanical scan time. Performance of the ψ-ray CT system is confirmed by measuring a test piece and a stepping motor (diameter: 5 cm; main material component: iron), for instance. It can represent these cross-sectional images with a spatial resolution of 1.5 mm. About 10 min are required to obtain these images using a 100 mCi 137Cs source. |
