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Proceedings Paper

Quasi-monochromatic x-ray production from the cerium target
Author(s): Eiichi Sato; Yasuomi Hayasi; Hidezo Mori; Etsuro Tanaka; Kazuyoshi Takayama; Hideaki Ido; Kimio Sakamaki; Yoshiharu Tamakawa
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Paper Abstract

Quasi-monochromatic x-ray production from the plasma flash x-ray generator having a cerium-target radiation tube is described. The K-series characteristic x-rays from the cerium target are very useful in order to perform angiography using iodine-based contrast medium because the photon energies of the x-rays are just over the K-absorption edge of iodine. The generator employs a high-voltage power supply, a low-impedance coaxial transmission line, a high- voltage condenser with a capacity of 200 nF, a turbo- molecular pump, thyristor pulse generator as a trigger device, and a flash x-ray tube. The high-voltage main condenser is charge dup to 60 kV by the power supply, and the electric charges in the condenser are discharged to the tube after triggering the cathode electrode. The flash x- rays are then produced. The x-ray tube is of a demountable triode that is connected to the turbo molecular pump with a pressure approximately 1 mPa. As the electron flows from the cathode electrode are roughly converged to the cerium target by the electric field in the tube, the plasma x-ray source, which consists of metal ions and electrons, forms by the target evaporating. Both the tube voltage and current displayed damped oscillations, and their peak values increased according to increases in the charging voltage. In the present work, the peak tube voltage was much higher than the initial charging voltage of the main condenser, and the peak current was about 25 kA with a charging voltage of 60kV. When the charging voltage was increased, the plasma x- ray source formed, and the characteristic x-ray intensities of K-series lines increased. In this experiment, we observed low-photon-energy bremsstrauhlung rays at the region of less than the K-absorption edge, because the tube current maximized at a low tube voltage.

Paper Details

Date Published: 18 December 2000
PDF: 12 pages
Proc. SPIE 4142, Penetrating Radiation Systems and Applications II, (18 December 2000); doi: 10.1117/12.410568
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Yasuomi Hayasi, Hachinohe National College of Technology (Japan)
Hidezo Mori, Tokai Univ. School of Medicine (Japan)
Etsuro Tanaka, Tokai Univ. School of Medicine (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)
Hideaki Ido, Tohoku Gakuin Univ. (Japan)
Kimio Sakamaki, Iwate Medical Univ. (Japan)
Yoshiharu Tamakawa, Iwate Medical Univ. (Japan)

Published in SPIE Proceedings Vol. 4142:
Penetrating Radiation Systems and Applications II
F. Patrick Doty; H. Bradford Barber; Hans Roehrig; Edward J. Morton, Editor(s)

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