1. Department of Radiation-Applied Biology Research, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma, Japan
2. Faculty of Engineering, Maebashi Institute of Technology, Maebashi, Gunma, Japan
3. Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
4. Faculty of Life Sciences, Toyo University, Itakura, Gunma, Japan