Abstract
A new target station that generates a thermal neutron field based on a 30-MeV proton accelerator was designed for the basic study of boron neutron capture therapy (BNCT). The calculated thermal neutron fluxes at the sample regions under free air conditions reached 2.84 × 109 [n/cm2/s]. The fast neutron and gamma ray dose rates per thermal neutron flux in several regions were on the order of 10−13 [Gy⋅cm2]. The beam characteristics were found to be closer to those of the heavy-water neutron irradiation facility of Kyoto University Research Reactor, which is an established facility in BNCT research. In addition, the shielding size for the new target station was realistically estimated for long-term beam operation.
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