The Development of the neutron measurement technology for the establishment of the accelerator-based BNCT

Nio, Daisuke; Nakashima, Hiroshi; Sakasai, Kaoru  ; Takamiya, Koichi*; Tanaka, Susumu*; Kumada, Hiroaki*

The stability of neutron flux intensity at an accelerator-based BNCT facility is relatively worse than that at a reactor-based one. Therefore, it is necessary to measure the neutron flux precisely in real-time to optimize the patient's exposure dose for the accelerator-based BNCT. However, the neutron flux is so intense (about 10(n/cm/s)) that the real-time measurement has not been realized yet. Hence we tried to measure the neutron flux with a small detector using a Eu:LiCaF scintillator on the tip of optical fibers. We have carried out some experiments to check the followability and the linearity of the detector to the reactor power at KUR.