1. Division of Radiation Oncology Kobe University Graduate School of Medicine 7‐5‐2 Kusunokicho, Chuouku Kobe Hyogo650‐0017 Japan
2. Department of Electrical Engineering and Computer Science Graduate School of Engineering University of Hyogo 2167 Shosha Himeji Hyogo671‐2280 Japan
3. Laboratory of Advanced Science and Technology for Industry University of Hyogo 3‐1‐2 Kouto, Kamigoricho Akogun Hyogo678‐1205 Japan
4. Co‐creative Research Center of Industrial Science and Technology Kanazawa Institute of Technology 3‐1 Yatsukaho Hakusan Ishikawa924‐0838 Japan
5. Meisyo Kiko Co., Ltd 148 Numa, Hikamicho Tamba Hyogo669‐3634 Japan
6. Nuclear Science and Engineering Center Japan Atomic Energy Agency 2‐4 Shirakata Tokai Ibaraki319‐1195 Japan