Nuclear Engineering and Technology

  • 제49권4호
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  • Pages.801-809
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  • 2017
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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An Assessment of the Secondary Neutron Dose in the Passive Scattering Proton Beam Facility of the National Cancer Center

  • 투고 : 2016.08.11
  • 심사 : 2016.12.05
  • 발행 : 2017.08.25
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초록

The purpose of this study is to assess the additional neutron effective dose during passive scattering proton therapy. Monte Carlo code (Monte Carlo N-Particle 6) simulation was conducted based on a precise modeling of the National Cancer Center's proton therapy facility. A three-dimensional neutron effective dose profile of the interior of the treatment room was acquired via a computer simulation of the 217.8-MeV proton beam. Measurements were taken with a $^3He$ neutron detector to support the simulation results, which were lower than the simulation results by 16% on average. The secondary photon dose was about 0.8% of the neutron dose. The dominant neutron source was deduced based on flux calculation. The secondary neutron effective dose per proton absorbed dose ranged from $4.942{\pm}0.031mSv/Gy$ at the end of the field to $0.324{\pm}0.006mSv/Gy$ at 150 cm in axial distance.

키워드

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  3. Technical commissioning of the spot scanning system in Shanghai Proton Therapy Facility vol.4, pp.1, 2017, https://doi.org/10.1007/s41605-019-0148-5
  4. Neutron dose and its measurement in proton therapy-current State of Knowledge vol.93, pp.1107, 2017, https://doi.org/10.1259/bjr.20190412
  5. ASSESSMENT OF AMBIENT NEUTRON DOSE EQUIVALENT IN SPATIALLY FRACTIONATED RADIOTHERAPY WITH PROTONS USING PHYSICAL COLLIMATORS vol.189, pp.2, 2020, https://doi.org/10.1093/rpd/ncaa030
  6. 몬테칼로 시뮬레이션을 활용한 양성자가속기 단기사용 시 구성품의 방사화 평가 vol.43, pp.5, 2017, https://doi.org/10.17946/jrst.2020.43.5.389