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10 kHz microsecond pulsed x-ray generator utilising and hot-cathode triode with variable durations for biomedical radiography


, : 10 kHz microsecond pulsed x-ray generator utilising and hot-cathode triode with variable durations for biomedical radiography. Medical & Biological Engineering & Computing 32(3): 295-301

A 10 kHz pulsed X-ray generator utilising a hot-cathode triode in conjunction with a new type of grid control device for controlling X-ray duration is described. The energy-storage condenser was charged up to 70 kV by a power supply, and the electric charges in the condenser was discharged to the X-ray tube repetitively by the grid control device. The maximum values of the grid voltage (negative value), the tube voltage, and the tube current were -1.5 kV, 70 kV, and 0.4 A, respectively. The duration of the flash X-ray pulse was primarily determined by the time constant of the grid control device and the cut-off voltage of thermoelectrons. The X-ray duration was controlled within a region of less than 1 ms; the X-ray intensity with a pulse width of 0.27 ms, a charged voltage of 70 kV, and a peak tube current of 0.4 A was 0.92 mu-C kg-1 at 0.5 m per pulse. The maximum repetition rate was about 10 kHz, and the size of the focal spot was about 3.5 times 3.5 mm.

US$29.90

PMID: 7934253


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