| 摘要 |
PURPOSE:To find out a defect of an object to be photographed easily by attaching a jig made of material with an equal transmission coefficient with reference to radial rays to the object to be photographed and equalizing the transmission thickness of the radial rays of the object to be photographed. CONSTITUTION:In order to inspect, for instance, the defect of a weld zone 3 of a thick-walled pipe 4, the radial rays 5 are irradiated from the upper part and a photosensitive film is placed on the other side to photograph the transmitted radial rays. At this time, since the transmission thickness of the transmitted radial rays is different, an internal jig 2 is buried in the inside of the object 3 to be photographed and an external jig 1 is attached thereto so that the upper and under surfaces are made parallel. Further, the transmission coefficient of the radial rays of the internal and external jigs 2 and 1 are equalized to that of the object 3 to be photographed. Then, when a photograph is taken by attaching the internal and external jigs 2 and 1 to the object 3, the transmission of the radial rays is equal and made with equal thickness at each part and the density of the photosensitive film is made proper and the defect can be easily found out. Accordingly, even the object to be photographed such as a round bar or a cylindrical material body is photographed without remaining a dead angle and the defect can be found out easily and accurately. |
