Compact monochromatic flash x-ray generator utilizing a disk-cathode molybdenum tube.
The high-voltage condensers in a polarity-inversion two-stage Marx surge generator are charged from -50 to -70 kV by a power supply, and the electric charges in the condensers are discharged to an x-ray tube after closing gap switches in the surge generator with a trigger device. The x-ray tube is a demountable diode, and the turbo molecular pump evacuates air from the tube with a pressure of approximately 1 mPa. Clean molybdenum Kalpha lines are produced using a 20 microm-thick zirconium filter, since the tube utilizes a disk cathode and a rod target, and bremsstrahlung rays are not emitted in the opposite direction to that of electron acceleration. At a charging voltage of -70 kV, the instantaneous tube voltage and current were 120 kV and 1.0 kA, respectively. The x-ray pulse widths were approximately 70 ns, and the generator produced instantaneous number of Kalpha photons was approximately 3 x 10(7) photons/cm2 per pulse at 0.5 m from the source of 3.0 mm in diameter.
Sato
Eiichi
E
Department of Physics, Iwate Medical University, Morioka 020-0015, Japan. dresato@iwate-med.ac.jp
Tanaka
Etsuro
E
Mori
Hidezo
H
Kawai
Toshiaki
T
Ichimaru
Toshio
T
Sato
Shigehiro
S
Takayama
Kazuyoshi
K
Ido
Hideaki
H
D000818:Animals; D017023:Coronary Angiography / Q000379:methods; D004566:Electrodes; D004583:Electrons; D005471:Fluoroscopy; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007834:Lasers; D008027:Light; D008982:Molybdenum / Q000378:metabolism*; D017785:Photons; D011817:Rabbits; D013997:Time Factors; D014414:Tungsten; D014964:X-Ray Therapy / Q000295:instrumentation* / Q000379:methods; D014965:X-Rays; D015040:Zirconium
D008982:Molybdenum; D015040:Zirconium; D014414:Tungsten