Fig 1.
Schematic illustration of the accelerator-based BNCT system.
Fig 2.
Schematic illustration of the target structure.
Fig 3.
Setup around the target in the accelerator-based BNCT system.
(a) The setup of the target structure for the accelerator-based BNCT system and (b) the setup of the target for the thermometer camera.
Fig 4.
Schematic illustration of evaluation of the proton profile.
(a) The static beam evaluation and (b) the wobbling beam evaluation.
Fig 5.
Measurement geometry for neutron irradiation on gold.
(a) A picture of the actual measurement setup and (b) measurement schematic.
Fig 6.
Measurement results for each proton profile obtained using the thermometer camera.
(a) Proton profile for target structure 1 and (b) target structures 2, 3, and 4. Although these results are only for wobbling beams applied to the target structure, static beams were also evaluated in this study.
Table 1.
Parameters of the static beam profile for each target.
Table 2.
Parameters of the wobbling beam profile for each target.
Fig 7.
Relationship between efficiency of neutron production and the number of protons delivered to each target structure.
(a) Relationship for target structures 1–4 and (b) focus on relationship for target structure 3.
Fig 8.
Pictures of the surface of each target structure before and after washing away of the Li target.
A certain number of protons were delivered to each target structure. In the caption notation “(x-y)”, “x” is the target structure number and “y” indicates before (“1”) or after (“2”) washing away of the Li target. The apparent angle of the target structure in Fig 8 corresponds to that in Fig 6. Target structure 4 wrapped in plastic before the Li target was washed away to avoid contact with the radioactive contaminant. Hence, the (4–1) results are not clear.
Table 3.
Target condition in each of four targets.