The constructions and the electric characteristics of a microsecond repetitive pulsed x-ray generator having a hot-cathode triode are described. This generator consisted of the following major components: a constant positive high-voltage power supply, an energy-storage condensr of 97 nF, a DC power supply for the filament (hot cathode), and a grid-voltage controller. In the present work, the energy-stotage condenser was charged from 50 to 70 kV by the power supply, and the electric charges in the condenser were repetitively discharged to the triode by controling the grid voltage. The duration of pulsed x rays was controlled within a range of 1ms, and the maximum repetition rate had a value of about 30 kHz. The x-ray intensity increased according to increases in the charged voltage, the duration, and the filament temperature.
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