In recent years, boron neutron capture therapy (BNCT) as a radiotherapy with neutron has attracted attention by recent progress of technology for an accelerator. Several accelerator-based neutron sources for BNCT are being developed in the world. In particular, in Japan, clinical trials of BNCT are being already conducted in a hospital by using the cyclotron-based neutron source for BNCT. Furthermore, some linac-based BNCT devices by combining with different target system and proton energy have been produced, and preparations for clinical trials by using the devices are being progressed.
