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http://dx.doi.org/10.1016/j.net.2016.12.003

An Assessment of the Secondary Neutron Dose in the Passive Scattering Proton Beam Facility of the National Cancer Center  

Han, Sang-Eun (Korea Institute of Nuclear Safety)
Cho, Gyuseong (Korea Advanced Institute of Science and Technology)
Lee, Se Byeong (Proton Therapy Center, National Cancer Center)
Publication Information
Nuclear Engineering and Technology / v.49, no.4, 2017 , pp. 801-809 More about this Journal
Abstract
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.
Keywords
MCNP; Neutron Dose Assessment; Proton Therapy; Secondary Neutron;
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