| 摘要 |
PURPOSE:To enhance work efficiency and workability by providing a tube exterior shield, tube interior shield and radiation source. CONSTITUTION:The device is provided with a aligning mechanism in which a radiation source 3 is held in the center of a tube 1 by means of a pantograph mechanism consisting of links 7, 9, springs 26, 34, rollers 8, 10, etc., at the tip of a flexible tube 16; also the device is constituted of the main body of a radiographic device, which is provided with a tube interior shield, and a tube exterior shield consisting of shields 19a, 19b, 17a and 17b. The exterior shield 17b is provided with a slit 43 and a radiation dose detector 18, which is fixed opposite to a tube welding part, and a film 4 is set in the whole area inside the annular groove of the exterior shields 17a, 17b. Then, by the flexible tube 16, the main body of the radiographic device is pushed inside the tube together with tube interior shields 5a, 5b. Radioactive rays from the radiation source are detected through the slit 43 by the detector 18; after the radiation source is accurately positioned in the tube welding part 2, the film position of the exterior shield is made ready; and photographing is performed by retreating the interior shield. Thus, the leakage of radioactive rays is prevented during photographing. |
