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<p>This study aims to quantitatively evaluate the photoneutrons produced by each accessory of the accelerator head using Monte Carlo simulation. First, the elements simulated in MCNP6 are tungsten, with a density of 19.25&#xa0;g/cm<sup>3</sup>, and copper, with 8.96&#xa0;g/cm<sup>3</sup>. Second, the accessories include a primary collimator, jaw, flattening filter, and single/composite targets, vary depending on the photon beam energy. The neutron energy spectrum was obtained using the F2 tally function on the sphere’s surface with a field size of 10 × 10 cm<sup>2</sup>. Additionally, the contribution of neutron generation from each accessory in the head part was analyzed. As a result, neutron generation was observed in the 15–20&#xa0;MeV energy range, reflecting the threshold energy for the photonuclear interaction of each element. At lower photon beams (8 and 10&#xa0;MeV), the target consists only of copper. More than 75% of all generated neutrons are caused by the primary collimator. It was found that photoneutron generation is significantly influenced by the composition of the material used and that neutron production increased rapidly near the beam interaction point. Hence, it is concluded that using copper elements could efficiently reduce radiation exposure, minimizing patient dose and contributing to the reduction and management of photoneutron production for improved safety in radiotherapy applications.</p>

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Quantitative evaluation and analysis of photoneutrons in medical linear accelerator with MCNP6

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Donghee Han,
  • Kiyoon Lee,
  • Kyunghwan Jung,
  • Jangoh Kim,
  • Jongyul Kim,
  • Toshioh Fujibuchi,
  • Changho Lee,
  • Cheolha Baek

摘要

This study aims to quantitatively evaluate the photoneutrons produced by each accessory of the accelerator head using Monte Carlo simulation. First, the elements simulated in MCNP6 are tungsten, with a density of 19.25 g/cm3, and copper, with 8.96 g/cm3. Second, the accessories include a primary collimator, jaw, flattening filter, and single/composite targets, vary depending on the photon beam energy. The neutron energy spectrum was obtained using the F2 tally function on the sphere’s surface with a field size of 10 × 10 cm2. Additionally, the contribution of neutron generation from each accessory in the head part was analyzed. As a result, neutron generation was observed in the 15–20 MeV energy range, reflecting the threshold energy for the photonuclear interaction of each element. At lower photon beams (8 and 10 MeV), the target consists only of copper. More than 75% of all generated neutrons are caused by the primary collimator. It was found that photoneutron generation is significantly influenced by the composition of the material used and that neutron production increased rapidly near the beam interaction point. Hence, it is concluded that using copper elements could efficiently reduce radiation exposure, minimizing patient dose and contributing to the reduction and management of photoneutron production for improved safety in radiotherapy applications.