The radiographic characteristics of a high-intensity kilohertz-range stroboscopic x-ray generator (SX-C98) are described. This generator consists of the following major components: a controller, a condenser unit having a Cockcroft circuit, and an x-ray tube unit in conjunction with a grid controller. The main condenser of about 500 nF in the unit is charged up to 100 kV by the circuit, and the electric charges in the condenser are discharged to the triode by the grid controller. Although the tube voltage slightly decreased during the discharging for generating x-rays, the maximum value was equivalent to the initial charging voltage of the main condenser. The maximum values of the tube current and the repetition rate were about 0.5 A and 32 kHz, respectively. The pulse width of the x-rays ranged from approximately 0.01 to 1.0 ms, and the maximum shot number had a value of 32. At a constant filament (cathode) temperature, the x-ray intensity increased according to increases in the charging voltage and to increases in the duration, and the intensity with a duration of about Ims and a charging voltage of 70 kV was 140 nC/kg at 1.0 m per pulse. When the charging voltage was increased, the dimension of the focal spot slightly increased, and the maximum values were about 3.5 X 3.5 mm.