The fundamental studies for the single flash x-ray generat r utilizing a compact diode for soft radiography are described. This generator consisted of the following essential components: a highvoltage power supply, a ready-made pulse condenser of 95nF-100kV, a single high-voltage impulse switching system, a turbo molecular pump, and a flash x-ray tube with a coaxial cable of 20D (5.0m). The flash x-ray tube was of the compact diode type which was connected to the turbo molecular pump with a constant pressure of 1.1×10-3 Pa and consisted of the following major devices: a long anode tip made of tungsten, a ring-shaped cathode made of graphite, a vacuum vessel made of stainless steel, an internal output mouth of x-rays, a polyoxymethylene insulator, diaghragms, and an x-ray window made of polyethylene terephthalate. Tihis generator employed a simple transmission line, and the condenser in the pulser was charged from 50 to 80kV by the power supply, and the electric charges in the condenser were discharged to the x-ray tube through a coaxial cable by the impulse switching system. The peak tube voltage increased according to increases in the condenser charged voltage and to increases in the anoe-cathode plane (A-Cp) space. The peak tube current primarily increased when the charged voltage was increased, and its value was less than 7kA. The pulse width of the flash xrays ranged from 100 to 200ns, and the time integrated x-ray intensity with a charged voltage of 77kV and an A-Cp space of 1.5mm was about 1μC/kg at 1.0m from the source. The effective focal spot size was primarily determined by the diameter of the anode tip, and its value was 3.0mm when an anode diameter of 3.0mm was employed.
抄録全体を表示