| 摘要 |
PURPOSE:To attempt to shorten the measuring time, simplify the construction of the device and improve the reliability thereof by arranging a plurality of radiation detectors around the circumference of a body to be detected, and arranging radioactive shielding thin plates around the circumference of the body as described above. CONSTITUTION:Detectors 31, 32 are arranged radially on a circumference 4 where the gamma-ray incident surface is brought into contact with the circumference 4 concentric to a fault image reconstruction range 2. The thin plates 51, 52,... of a collimator 5 are supported on the circumference 4 so that they can swing around points 61, 62... on the border of adjacent detectors 31 and 32. Since gamma-rays irradiated from the body 1 to be detected pass through gaps between auxiliary thin plates 71, 72... and reach one detector, collimation in the direction of the circumference 4 is improved. When the thin plates 51 and 52 are swung, the auxiliary thin plates 71, 72... swing. For this reason, gamma-rays in various directions can be detected by the same detector, and the entire data can be obtained in a short period of time. Further, since the collimator 5 is constituted by thin plates, the construction of the device can be made compact, and since the detectors 31, 32... are fixed, the reliability of the device can be improved.
|
