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Compact monochromatic flash x-ray generator utilizing a disk-cathode molybdenum tube.

Eiichi Sato1, Etsuro Tanaka, Hidezo Mori

  • 1Department of Physics, Iwate Medical University, Morioka 020-0015, Japan. dresato@iwate-med.ac.jp

Medical Physics
|February 22, 2005
PubMed
Summary

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This study presents a Marx surge generator producing clean molybdenum Kalpha X-rays. The system achieves high photon flux for potential applications in advanced imaging and materials science.

Area of Science:

  • Physics
  • Materials Science

Background:

  • Marx surge generators are crucial for high-voltage pulsed power applications.
  • Generating characteristic X-ray lines with high purity is essential for various scientific and industrial uses.

Purpose of the Study:

  • To develop and characterize a polarity-inversion two-stage Marx surge generator for producing clean molybdenum Kalpha X-rays.
  • To optimize the system for high instantaneous photon flux and narrow pulse width.

Main Methods:

  • Utilized a two-stage Marx surge generator charged to -50 to -70 kV.
  • Employed a demountable diode X-ray tube with a disk cathode and rod target.
  • Used a zirconium filter to isolate molybdenum Kalpha lines and a turbo molecular pump for vacuum maintenance.
  • Triggered discharge via gap switches for X-ray generation.

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Main Results:

  • Achieved instantaneous tube voltage and current of 120 kV and 1.0 kA at -70 kV charging voltage.
  • Produced X-ray pulse widths of approximately 70 ns.
  • Generated approximately 3 x 10(7) Kalpha photons/cm2 per pulse at 0.5 m with a 3.0 mm source diameter.
  • Successfully filtered out bremsstrahlung radiation.

Conclusions:

  • The developed Marx surge generator effectively produces high-intensity, clean molybdenum Kalpha X-ray pulses.
  • The system's design minimizes unwanted radiation, enhancing spectral purity.
  • The high photon flux and short pulse duration indicate suitability for advanced applications.