10 kHz microsecond pulsed X-ray generator utilising a hot-cathode triode with variable durations for biomedical radiography.
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 were 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 microC 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 x 3.5 mm.
Sato
E
E
Department of Physics, Iwate Medical University, Morioka, Japan.
Sagae
M
M
Takahashi
K
K
Shikoda
A
A
Oizumi
T
T
Hayasi
Y
Y
Tamakawa
Y
Y
Yanagisawa
T
T
D000818:Animals; D002933:Cineradiography / Q000295:instrumentation; D004285:Dogs; D004582:Electronics, Medical; D008433:Mathematics; D011859:Radiography / Q000295:instrumentation*; D013902:Radiography, Thoracic / Q000295:instrumentation; D013679:Technology, Radiologic; D013997:Time Factors; D014965:X-Rays