Kilohertz-Range Sub-Millisecond Flash X-Ray Generator Utilizing a Hot-Cathode Triode
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概要
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A repetitive kilohertz-range flash x-ray generator utilizing a hot-cathode triode in conjunction with a new type of grid control device is described. This generator consisted of the following essential components: a constant high-voltage power supply with a maximum voltage of 100 kV, an energy storage condenser of 97 nF, a repetitive grid control device, and a hot-cathode triode. The energystorage condenser was charged from 50 to 70 kV by a power supply, and the electric charges in the condenser were discharged repetitively by the grid electrode driven by the grid control device. The maximum values of both the tube voltage and the tube current were 70 kV and about 0.4 A, respectively. The duration of pulsed x rays was primarily determined by the time constant of the grid control device and the cutoff voltage of thermoelectrons. The effective duration and the x-ray intensity were about 0.8 ms and 0.62μC/kg at 1.0m per pulse, respectively, with an initial grid voltage of -1.5 kV, a charging resistance of 2.0 MΩ, and a condenser charged voltage of 70 kV. The maximum repetitive frequency was about 1 kHz, and the size of the x-ray source was less than 4×4mm.
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