Journal ArticleDOI
Repetitive flash x‐ray generator utilizing a simple diode with a new type of energy‐selective function
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TLDR
In this article, the authors described the construction and fundamental studies of a repetitive flash x-ray generator having a simple diode with an energy-selective function. But the generator was not designed for high-energy impulse switching.Abstract:
The construction and the fundamental studies of a repetitive flash x‐ray generator having a simple diode with an energy‐selective function are described. This generator consisted of the following components: a constant high‐voltage power supply, a high‐voltage pulser, a repetitive high‐energy impulse switching system, a turbo molecular pump, and a flash x‐ray tube. The circuit of this pulser employed a modified two‐stage surge Marx generator with a capacity during main discharge of 425pF. The x‐ray tube was of the demountable‐diode type which was connected to the turbo molecular pump and consisted of the following major devices: a rod‐shaped anode tip made of tungsten, a disk cathode made of graphite, an aluminum filter, and a tube body made of glass. Two condensers inside of the pulser were charged from 40 to 60 kV, and the output voltage was about 1.9 times the charging voltage. The peak tube voltage was primarily determined by the anode‐cathode (A‐C) space, and the peak tube current was less than 0.6 kA. The peak tube voltage slightly increased when the charging voltage was increased, but the amount of change rate was small. Thus, the maximum photon energy could be easily controlled by varying the A‐C space. The pulse width ranged from 40 to 100 ns, and the x‐ray intensity was less than 1.0 μC/kg at 0.3 m per pulse. The repetitive frequency was less than 50 Hz, and the effective focal spot size was determined by the diameter of the anode tip and ranged from 0.5 to 3.0 mm in diameter.read more
Citations
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Journal ArticleDOI
Repetitive flash x‐ray generator having a high‐durability diode driven by a two‐cable‐type line pulser
TL;DR: In this paper, the fundamental studies of a repetitive soft flash x-ray generator having a high-durability diode for high-speed radiography in biomedical and technological fields are described.
Journal ArticleDOI
Fundamental study on a long-duration flash X-ray generator with a surface-discharge triode
TL;DR: In this article, a long-duration flash X-ray generator was described, which consisted of the following components: a high-voltage power supply with a maximum voltage of 100 kV, an energy-storage condenser, a main discharge condenser of 10 nF, a turbo molecular pump, a thyratron pulser as a trigger device, and a surface-discharge triode.
Journal ArticleDOI
Demonstration of enhanced K-edge angiography using a cerium target x-ray generator.
Eiichi Sato,Etsuro Tanaka,Hidezo Mori,Toshiaki Kawai,Toshio Ichimaru,Shigehiro Sato,Kazuyoshi Takayama,Hideaki Ido +7 more
TL;DR: The cerium target x-ray generator is useful in order to perform enhanced K-edge angiography using a cone beam because K-series characteristic x rays from the Cerium target are absorbed effectively by iodine-based contrast mediums.
Journal ArticleDOI
Quasi-monochromatic flash x-ray generator utilizing weakly ionized linear copper plasma
Eiichi Sato,Yasuomi Hayasi,Rudolf Germer,Etsuro Tanaka,Hidezo Mori,Toshiaki Kawai,Toshio Ichimaru,Kazuyoshi Takayama,Hideaki Ido +8 more
TL;DR: In this paper, a plasma flash x-ray generator with a 200 nF condenser is charged up to 50 kV by a power supply, and flash x rays are produced by the discharging.
Journal ArticleDOI
Sub-kilohertz flash X-ray generator utilising a glass-enclosed cold-cathode triode.
Eiichi Sato,Kei Takahashi,Michiaki Sagae,Shingo Kimura,Teiji Oizumi,Y. Hayasi,Yoshiharu Tamakawa,Toru Yanagisawa +7 more
TL;DR: The construction and fundamental studies are described for a subkilohertz X-ray generator for producing low-dose rate flash X-rays and high-speed radiography was performed.
References
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TL;DR: In this article, the theory of X-ray absorption and of the continuous Xray spectrum has been studied in the context of the XCIII theory and its application in the field of physics.
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Computed radiography utilizing scanning laser stimulated luminescence
TL;DR: A new system of computed radiography that is based on new concepts and the latest computer technologies has been developed and eliminates the drawbacks of conventional screen-film radiography.
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X-ray flash techniques
TL;DR: In this paper, the authors examined the problems of X-ray flash production and its applications, similar to those of continuous X-radiation, and showed that the flash time is mostly between 10 ns and 1 mu s.
Journal ArticleDOI
Generation of soft x rays using a rare gas-hydrogen plasma focus and its application to x-ray lithography
TL;DR: In this paper, a conventional plasma focus device was used to produce a hot, dense plasma which emits radiation strongly in the soft x-ray region and showed experimentally that a plasma produced from a mixture of hydrogen and a rare gas such as neon, argon, or krypton is an effective source of a characteristic x ray of the rare gas Resist exposures and pattern printings were made to evaluate the feasibility of this device as a source for soft xray lithography.
Journal ArticleDOI
High-intensity flash x-ray apparatus for biomedical radiography
TL;DR: In this paper, a soft flash x-ray (FX) apparatus with a new type of FX tube for biomedical use is described, which may be used for condenser charging voltages of 50-90 kV and peak currents of 20-40 kA. The electric pulse width of the FX waveforms was almost constant and its value was about 0.3 μs.