Influences of Neutron Source Spectrum and Thermal Neutron Scattering Law Data on the MCNPX Simulation of a Cyclotron-Based Neutron Field for Boron Neutron Capture Therapy
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概要
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In our previous study, the simulation of a cyclotron-based neutron field for boron neutron capture therapy (BNCT) using a (p,n) spallation source with the MCNPX code was validated through measurements of the neutron energy spectrum behind the moderator assembly and the thermal neutron distribution in an acrylic phantom using reaction rates of 198Au. These validations showed that the simulation generally well reproduced the measurements. However, some discrepancies between the measurements and the calculation remained for clinical trials. In this paper, we investigated the influences of neutron source spectrum and thermal neutron scattering law data in the simulation to resolve those discrepancies. We also compared measured and calculated neutron doses behind the moderator assembly with results obtained using a tissue equivalent proportional counter. We clarified that the neutron source spectrum calculated using the LA150 data led to the overestimation of high-energy neutrons in a phantom, but this overestimation did not significantly affect the neutron dose distribution in a phantom, because a dominant part of the absorbed dose is due to neutrons of energies below 1 MeV. The study of the influence of neutron scattering law data in a phantom also indicated that the use of selected S(α,β) data led to an improvement in the simulation of thermal neutron behavior.
- 社団法人 日本原子力学会の論文
- 2007-11-25
著者
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NAKAMURA Takashi
Cyclotron Radioisotope Center, Tohoku University
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BABA Mamoru
Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan
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Baba Mamoru
Cyclotron And Radioisotope Center Tohoku Univ.
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Baba Mamoru
Cyclotron And Radioisotope Center
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YONAI Shunsuke
Cyclotron and Radioisotope Center, Tohoku University
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YOKOBORI Hitoshi
Advanced Reactor Technology Co., Ltd.
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TAHARA Yoshihisa
Engineering Development, Ltd.
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ITOGA Toshiro
Cyclotron and Radioisotope Center, Tohoku University
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Yonai Shunsuke
Cyclotron And Radioisotope Center Tohoku University
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Tahara Yoshihisa
Engineering Development Ltd.
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Yokobori Hitoshi
Advanced Reactor Technology Co. Ltd.
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Itoga Toshiro
Cyclotron And Radioisotope Center Tohoku University
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Nakamura Takashi
Cyclotron And Radioisotope Center Tohoku University
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