F115 シンクロトロン単色 X 線源にかわる二種類の準単色平行 X 線撮影システム

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Two types of quasi-monochromatic parallel radiography systems instead of synchrotron monochromatic x-ray source are described. The systems are as follows : (a) plasma flash x-ray generator utilizing a polycapillary plate and (b) monochromatic x-ray generator in conjunction with a polycapillary. In the type (a) system, the high-voltage main condenser is charged up to 50 kV by the power supply, and the electric charges in the condenser are discharged to the tube after triggering the cathode electrode. The flash x-rays are then produced. As the electron flows from the cathode electrode are roughly converged to the copper plane target by the electric field in the tube, the plasma x-ray source, which consists of metalions and electrons, forms by the target evaporating. Both the tube voltage and current displayed damped oscillations, and their peak values increased according to increases in the charging voltage. In the present work, the peak tube voltage was almost equal to the initial charging voltage of the main condenser, and the peak current was about 20 kA with a charging voltage of 50 kV. When the charging voltage was increased, the plasma x-ray source formed, and the characteristic x-ray intensities of K-series lines increased. The dimensions of the focal spots were almost constant and were about 10 mm in diameter. In the radiography achieved with a computed radiography system, we employed a polycapillary plate with a hole diameter of 25 μm and a thickness of 1 mm. The image resolution was primarily determined by the resolution of the CR system and had a value of about 100 μm. Next, the type (b) system employs a transmission-type x-ray tube, and quasi-monochromatic x-rays were obtained by the target filtering. The x-rays are formed to parallel beam by the polycapillary, and parallel radiography was performed with an image resolution of about 100 μm. In the radiography, the maximum tube voltage was 30 kV, and the tube current was less than 1 mA.
日本流体力学会の論文
2002-07-23

F115 シンクロトロン単色 X 線源にかわる二種類の準単色平行 X 線撮影システム

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