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Purpose <p>The Dongguan People’s Hospital is constructing a boron neutron capture therapy facility based on the accelerator <sup>7</sup>Li(p,n)7Be reaction, with a beam energy of 2.8&#xa0;MeV and an average beam current of 20&#xa0;mA. The accelerator hall produces strong prompt radiation and residual radiation due to the proton beam bombarding the lithium target and accelerator components. To ensure radiation safety, radiation shielding designs have been carried out for the main walls, roof, floor, and shielding doors. Evaluating the residual radiation at key locations provided a reference for the staff to determine maintenance plans.</p> Method <p>Using the Monte Carlo simulation software FLUKA, we investigated the relationship between the neutron flux leaking into the accelerator room and the distance from the recoil neutron exit to the lithium target when a proton beam bombards the lithium target. Based on the initial structure, calculations, analysis, and discussions were conducted on the prompt radiation due to transmission, scattering, and leakage from multiple hotspots. Comparative study of the shielding effects of the shielding door under different composite shields was conducted. The variation of residual radiation at key positions of the accelerator with cooling time was studied.</p> Results and conclusions <p>By optimizing the design, the maximum number of neutrons leaking into the accelerator room is 1.7e11 per second. The shielding design meets the requirements for prompt radiation protection. The location of the recoil neutron is identified as the core area for residual radiation. Future maintenance of this area will require strict control of exposure time to ensure the safety of the staff.</p>

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Radiation and shielding design of the accelerator hall for boron neutron capture therapy facility

  • 期刊论文

  • 发表日期：

    2025年10月12日

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  • Gang Zhang,
  • Qiongyao Liu,
  • Lun Li,
  • Yufei Wang,
  • Xiuxia Cao,
  • Yinglin Ma,
  • Qingbiao Wu,
  • Qingbin Wang,
  • Huafu Ouyang

摘要

Purpose

The Dongguan People’s Hospital is constructing a boron neutron capture therapy facility based on the accelerator 7Li(p,n)7Be reaction, with a beam energy of 2.8 MeV and an average beam current of 20 mA. The accelerator hall produces strong prompt radiation and residual radiation due to the proton beam bombarding the lithium target and accelerator components. To ensure radiation safety, radiation shielding designs have been carried out for the main walls, roof, floor, and shielding doors. Evaluating the residual radiation at key locations provided a reference for the staff to determine maintenance plans.

Method

Using the Monte Carlo simulation software FLUKA, we investigated the relationship between the neutron flux leaking into the accelerator room and the distance from the recoil neutron exit to the lithium target when a proton beam bombards the lithium target. Based on the initial structure, calculations, analysis, and discussions were conducted on the prompt radiation due to transmission, scattering, and leakage from multiple hotspots. Comparative study of the shielding effects of the shielding door under different composite shields was conducted. The variation of residual radiation at key positions of the accelerator with cooling time was studied.

Results and conclusions

By optimizing the design, the maximum number of neutrons leaking into the accelerator room is 1.7e11 per second. The shielding design meets the requirements for prompt radiation protection. The location of the recoil neutron is identified as the core area for residual radiation. Future maintenance of this area will require strict control of exposure time to ensure the safety of the staff.