An Assessment of the Secondary Neutron Dose in the Passive Scattering Proton Beam Facility of the National Cancer Center
An Assessment of the Secondary Neutron Dose in the Passive Scattering Proton Beam Facility of the National Cancer Center
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DOI：
10.1016/j.net.2016.12.003
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发表时间：
2017-06-01
影响因子：
2.7
通讯作者：
Lee, Se Byeong
中科院分区：
文献类型：
--
作者：
Han, Sang-Eun;Cho, Gyuseong;Lee, Se Byeong
本研究的目的是评估被动散射质子治疗中额外的中子有效剂量。蒙特卡罗代码（蒙特卡罗n粒子6）模拟是在对国家癌症中心质子治疗设施进行精确建模的基础上进行的。通过对217.8 mev质子束的计算机模拟，获得了治疗室内部的三维中子有效剂量谱。用氦-3中子探测器进行了测量以支持模拟结果，其平均比模拟结果低16%。二次光子剂量约为中子剂量的0.8%。通过通量计算，推导出优势中子源。次级中子每质子吸收剂量的有效剂量范围从场末的4.942 +/- 0.031 mSv/Gy到轴向距离150 cm处的0.324 +/- 0.006 mSv/Gy。(C) 2017 Korea Nuclear Society， Elsevier Korea LLC出版。
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 He-3 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 +/- 0.031 mSv/Gy at the end of the field to 0.324 +/- 0.006 mSv/Gy at 150 cm in axial distance. (C) 2017 Korean Nuclear Society, Published by Elsevier Korea LLC.