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Proceedings Paper

Repetitive flash x-ray generator utilizing an enclosed-type diode with a ring-shaped graphite cathode
Author(s): Hiroshi Isobe; Eiichi Sato; Shingo Kimura; Yoshiharu Tamakawa; Toru Yanagisawa; Keiji Honda; Yoshiharu Yokota
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Paper Abstract

The fundamental studies of the repetitive type of flash x-ray generator utilizing an enclosed-type diode with a ring-shaped graphite cathode for soft radiography are described. This generator consisted of the following essential components: a constant high-voltage power supply, an energy storage condenser of lOOnF, a highvoltage pulser, a repetitive impulse switching system, and a flash x-ray tube. The pulser employed a modified two-stage Marx circuit with a capacity during main discharge of 425pF. The x-ray tube was of the enclosed-diode type and consisted of the following major devices: a rod-shaped anode tip made of tungsten, a ring cathode made of graphite, an x-ray window made of beryllium, a spattering shield made of stainless steel, and a tube body made of glass. Two condensers in the pulser were charged from 50 to 70kV, and the output voltage was about 1. 6 times the charged voltage. Both the peak tube voltage and the peak tube current increased according to increases in the charged voltage, and the maximum values of the voltage and the current were about 90kV and 0. 5kA, respectively. The pulse width was about lOOns, and the x-ray intensity was less than 2. OpC/kg at 0. 5m per pulse. The repetition frequency was less than 50Hz, and the maximum size of the effective focal spot was nearly equivalent to the anode diameter of 3. 0mm.

Paper Details

Date Published: 1 April 1991
PDF: 8 pages
Proc. SPIE 1358, 19th Intl Congress on High-Speed Photography and Photonics, (1 April 1991); doi: 10.1117/12.24041
Show Author Affiliations
Hiroshi Isobe, Iwate Medical Univ. (Japan)
Eiichi Sato, Iwate Medical Univ. (Japan)
Shingo Kimura, Iwate Medical Univ. (Japan)
Yoshiharu Tamakawa, Iwate Medical Univ. (Japan)
Toru Yanagisawa, Iwate Medical Univ. (Japan)
Keiji Honda, Hitachi Medical Inc. (Japan)
Yoshiharu Yokota, Hitachi Medical Inc. (Japan)

Published in SPIE Proceedings Vol. 1358:
19th Intl Congress on High-Speed Photography and Photonics
Peter W. W. Fuller, Editor(s)

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