Basic information on new regulatory criteria requiring on-site emergency preparedness for accelerator facilities in Japan |
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Authors: | Masatsugu Isse Koji Niita Takashi Nakamura |
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Affiliation: | 1. Radiation Protection and Safeguards Division, Secretariat of Nuclear Regulation Authority, Tokyo, Japan;2. Research Organization for Information Science and Technology, Ibaraki, Japan;3. Cyclotron and Radioisotope Center, Tohoku University, Sendai, Japan |
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Abstract: | For basic information on new regulatory criteria, the dose rate around a thick target bombarded by proton, electron, or carbon beam having incident energy of 10 MeV–50 GeV (per nucleon in case of carbon) was simulated using the PHITS Monte Carlo code. Based on this simulation, the benchmark which is ‘1 Sv/h at 1 m away from the beam line’ assuming 1% beam loss was evaluated, and compared with the criteria in France and Canada. Based on this evaluation, a new regulatory criteria has been established for requiring on-site emergency preparedness for accelerator facilities in Japan, which is required for the ion accelerator beyond the ion beam of 100 MeV/nucleon and 0.5 kW beam power, and the electron accelerator beyond the electron beam of 50 MeV energy and 1 kW beam power. |
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Keywords: | PHITS safety assessment accelerator dose rate target proton electron carbon |
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