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Proceedings Paper

Polycapillary radiography using a quasi-x-ray-laser generator
Author(s): Eiichi Sato; Yasuomi Hayasi; Etsuro Tanaka; Hidezo Mori; Toshiaki Kawai; Haruo Obara; Toshio Ichimaru; Kazuyoshi Takayama; Hideaki Ido; Tatsumi Usuki; Koetsu Sato; Yoshiharu Tamakawa
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Paper Abstract

The characteristics of a new quasi-x-ray laser generator and its application to polycapillary radiography are described. The generator employs a high-voltage power supply, a low- impedance coaxial transmission line, a high-voltage condenser with a capacity of about 200 nF, a turbo-molecular pump, a thyristor pulse generator as a trigger device, and a new plasma flash x-ray tube. The high-voltage main condenser is charged up 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 of approximately 1 mPa. As the electron flows from the cathode electrode are roughly converged to the copper 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 increase in the charging voltage. In the present work, the peak tube voltage was almost equal to the initial charging voltage of the main condenser, and the peak current was about 25 kA with a charging voltage of 60 kV. When the charging voltage was increased, the linear plasma x-ray source formed, and the characteristic x-ray intensities of K-series lines increased. In the radiogrpahy achieved with a computed radiography system, we employed a polycapilary plate with a hole diameter of 20 micrometers and a thickness of 1 mm. The image resolution was primarily determined by the resolution of the CR system and had a value of about 100micrometers .

Paper Details

Date Published: 19 December 2001
PDF: 12 pages
Proc. SPIE 4508, Penetrating Radiation Systems and Applications III, (19 December 2001); doi: 10.1117/12.450786
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Yasuomi Hayasi, Hachinohe National College of Technology (Japan)
Etsuro Tanaka, Tokai Univ. (Japan)
Hidezo Mori, National Cardiovascular Ctr. Research Institute (Japan)
Toshiaki Kawai, Hamamatsu Photonics K.K. (Japan)
Haruo Obara, Tohoku Univ. (Japan)
Toshio Ichimaru, Hirosaki Univ. (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)
Hideaki Ido, Tohoku Gakuin Univ. (Japan)
Tatsumi Usuki, Toreck Co., Ltd. (Japan)
Koetsu Sato, Toreck Inc. (Japan)
Yoshiharu Tamakawa, Iwate Medical Univ. (Japan)


Published in SPIE Proceedings Vol. 4508:
Penetrating Radiation Systems and Applications III
H. Bradford Barber; Hans Roehrig; F. Patrick Doty; Richard C. Schirato; Edward J. Morton, Editor(s)

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