Repetitive flash x-ray generator operated at low-dose rates for a medical x-ray television system
1991
The fundamental studies for the repetitive flash x-ray generator operated at lowdose
rates for a medical x-ray television system are described. This x-ray
generator consisted of the following components: a high-voltage power supply, an
energy storage condenser of lOOnF, a coaxial cable condenser with a capacity of
l000pF, a repetitive impulse switching system, a turbo molecular pump, and an x-ray
tube having a cold cathode. The condenser was charged from 40 to 70kV by a power
supply, and the electric charges stored in the condenser were discharged
repetitively by using a trigger electrode operated by an impulse switching system.
The x-ray tube was of the triode-type which was connected to the turbo molecular
pump and had a large discharge impedance in order to prevent the damped
oscillations of the tube current and voltage. The maximum tube voltage was
equivalent to the initial charged voltage, and the peak current was less than 70A.
The durations were about 2ps, and the x-ray intensities were less than 1. OpC/kg at
0. 5m per pulse. The repetition frequency was less than 50Hz, and the effective
focal spot size was equivalent to the anode diameter of 3. 0mm. For the x-ray
television system used in conjunction with this repetitive pulsed x-ray generator,
since the electromagnetic noise primarily caused by the high tube current was
decreased, noise-free stroboscopic radiography performed by the television system
could be realized.
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