F111 近年のストロボ X 線装置と応用

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The constructions and major characteristics of recent stroboscopic x-ray generators and their applications to high-speed radiography are described. The generators are as follows : (a) low-photon-energy generator having a fixed-anode radiation tube with the maximum tube voltage of 100 kV, (b) 120 kV medical generator with a rotating-anode tube, and (c) high-photon-energy generator utilizing a fixed-anode tube with the maximum energy of about 300 keV. The type (a) and (b) generators employ large-capacity condensers of about 500 nF, and the electric charges in the condensers are discharged repetitively to each tube by controlling the grid voltage. The x-ray duration can be controlled from 0.01 to 1.0 ms, and the intensity increases according to increases in the charging voltage, the duration, and the filament voltage. When the inner triggering system is employed, the maximum repetition rate has a value of 32 kHz. Next, the type (c) generator has a high-voltage transformer and produces short x-ray pulses with widths of about 300 ns, and the maximum rate is about 1 kHz. The high-speed radiography was performed by a new computed radiography (CR) system, and stop-motion images of objects were obtained. Using the type (b) generator, the cavitation bubble cloud induced by underwater shock wave focusing was observed by the delayed radiography using a trigger-delay device. In the pre-radiography, we employed a long x-ray duration of 1.0 ms in order to roughly observe the cloud. In the main radiography, a short duration of about 0.22 ms was selected to decrease the bullring. Although we could observe the cavitation bubble cloud in water, the bubble could not be easily visualized in living frogs.
2002-07-23

F111 近年のストロボ X 線装置と応用

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