The constructions and the fundamental studies of a high-intensity flash x-ray generator having two flash x-ray tubes are described. This generator consisted of the following essential components: a high-voltage power supply, a high-voltage pulser, a thyratron pulser, a turbo molecular pump, and two flash x-ray tubes. The high-voltage pulser employed a polarity-inversion-type transmission line with two high-voltage outputs. The combined ceramic condenser of about 5 nF was charged from -60 to -80 kV by a power supply, and the electric charges in the condenser were discharged to two x-ray tubes through 5.0 m coaxial cables after closing a gap switch by the thyratron pulser. Using a tube, the pulse widths were less than 200 ns, and the x-ray intensity was less than 5 μ C/kg at 0.5 m per pulse. The maximum (peak) values of the tube voltage and the current were about.110 kV and 3 kA, respectively. When two tubes were employed, comparatively stable two x-ray outputs were obtained simultaneously.
