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

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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.
Publisher
KOREAN NUCLEAR SOC
Issue Date
2017-06
Language
English
Article Type
Article
Keywords

THERAPY BEAMS; EQUIVALENT; FIELD; MOTHER; FETUS

Citation

NUCLEAR ENGINEERING AND TECHNOLOGY, v.49, no.4, pp.801 - 809

ISSN
1738-5733
DOI
10.1016/j.net.2016.12.003
URI
http://hdl.handle.net/10203/225245
Appears in Collection
NE-Journal Papers(저널논문)
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