1. Investigation into activation of accelerators at various synchrotron radiation facilities in Japan
- Author
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Hajime Nakamura, Hiroshi Matsumura, Shohei Iwai, Fumiyoshi Nobuhara, Hirofumi Hanaki, Masahiro Sawada, Kenji Hayashi, Kazuyoshi Masumoto, Taichi Miura, Kiminori Goto, Go Yoshida, Jun Ishioka, Shinya Nagahashi, H. Miyauchi, Akihiro Toyoda, Koichi Nishikawa, Yasukazu Yamamoto, and Kotaro Bessho
- Subjects
Nuclear and High Energy Physics ,Nuclear Energy and Engineering ,Neutron flux ,Astrophysics::High Energy Astrophysical Phenomena ,Nuclear engineering ,Physics::Medical Physics ,Physics::Accelerator Physics ,Synchrotron radiation ,Environmental science ,Neutron temperature ,Nuclear decommissioning - Abstract
To establish systematic guidelines for accelerator decommissioning, a large-scale activation survey was conducted at representative synchrotron radiation facilities in Japan. The neutron flux during accelerator operation was measured with various dosimeters. A Monte Carlo simulation was conducted for some facilities to verify the special neutron distribution and their spectra. Beam loss points, reflected as high-dose-rate areas, were identified by a whole-beamline survey with a survey meter, and the generated radionuclides and their activity were determined with a lanthanum bromide (LaBr3) scintillation spectrometer. In all facilities, the activation level was quite low. Whole-beamline tunnels made of concrete were not activated, and no radionuclides were detected except for natural nuclides. In addition, almost all beamline components were either not or minimally activated. Although the acceleration energy is very high for radiation synchrotron facilities, the generation of radioactive waste would be very low.
- Published
- 2021