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Digital radiation imaging security inspection equipment offers advantages such as high detection efficiency, non-destructiveness, and non-contact, making it the most widely used security inspection equipment today. A dual-projection vehicle inspection system developed by Tsinghua University has already been successfully implemented at the entry and exit points of a nuclear facility, significantly ensuring the security of the facility. The imaging performance of an imaging system is intrinsically linked to the capabilities of its detectors. To further improve the performance of the imaging system, it is necessary to enhance the detection efficiency of the existing gas ionization chamber detectors. The main factors affecting the detection efficiency of the gas ionization chamber include the structure, size, and the composition and pressure of the working gas. In addition, the solid radiation effects on the electrode plates in the ionization chamber are also an important influencing factor. This study uses the Monte Carlo simulation software Geant4 to model the solid radiation effects on the electrode plates in the ionization chamber detector with a 60Co radiation source, and explores ways to improve the detection efficiency of the ionization chamber through optimization of the electrode plate design. This study simulated the transmission electron yield, photon energy deposition, emitted electron energy spectrum distribution, and emitted electron angular distribution for electrode plates of varying thicknesses and materials under gamma irradiation. Based on these results, the optimal electrode material and plate thickness can be determined. Subsequently, this paper investigates the behavior of emitted electrons from the electrode plates at different rotation angles. This research is crucial for gaining a deeper understanding of particle transport characteristics within gas ionization chambers and improving their detection efficiency. Additionally, it paves the way for broader applications and further development of ionization chamber detection technologies.

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Monte Carlo-Based Study of Solid Radiation Effects in Gaseous Ionization Chamber Electrodes

  • 会议论文

  • 发表日期：

    2026年

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  • Hongyin Zhang,
  • B. Jiahao Chang,
  • C. Helin Zhang,
  • D. Zirou Jiang,
  • E. Zhentao Wang,
  • F. Peng Tang,
  • G. Xinjun Liu

摘要

Digital radiation imaging security inspection equipment offers advantages such as high detection efficiency, non-destructiveness, and non-contact, making it the most widely used security inspection equipment today. A dual-projection vehicle inspection system developed by Tsinghua University has already been successfully implemented at the entry and exit points of a nuclear facility, significantly ensuring the security of the facility. The imaging performance of an imaging system is intrinsically linked to the capabilities of its detectors. To further improve the performance of the imaging system, it is necessary to enhance the detection efficiency of the existing gas ionization chamber detectors. The main factors affecting the detection efficiency of the gas ionization chamber include the structure, size, and the composition and pressure of the working gas. In addition, the solid radiation effects on the electrode plates in the ionization chamber are also an important influencing factor. This study uses the Monte Carlo simulation software Geant4 to model the solid radiation effects on the electrode plates in the ionization chamber detector with a 60Co radiation source, and explores ways to improve the detection efficiency of the ionization chamber through optimization of the electrode plate design. This study simulated the transmission electron yield, photon energy deposition, emitted electron energy spectrum distribution, and emitted electron angular distribution for electrode plates of varying thicknesses and materials under gamma irradiation. Based on these results, the optimal electrode material and plate thickness can be determined. Subsequently, this paper investigates the behavior of emitted electrons from the electrode plates at different rotation angles. This research is crucial for gaining a deeper understanding of particle transport characteristics within gas ionization chambers and improving their detection efficiency. Additionally, it paves the way for broader applications and further development of ionization chamber detection technologies.