| 夏井 拓也 | 2009.1~3 (D1) | Stanford Linear Accelerator Center (USA) |
| | |
| 小島 啓幸 | 2008.11~12 (M1) | University of Minnesota Medical Center (USA) |
| | |
| 森 梓 | 2008.9~11 (M1) | UCLA Particle Beam Physics Laboratory (USA) |
| | |
| 水野 和恵 | 2008.8~10 (D1) | Memorial Sloan-Kettering Cancer Center (USA) |
| | |
| 山本 智彦 | 2008.2~4 (D1) | Stanford Linear Accelerator Center (USA) |
| | |
| 前川 陽 | 2008.1~3 (D1) | Argonne National Laboratory (USA) |
| | |
| 水野 和恵 | 2007.6~8 (M2) | Massachusetts General Hospital (USA) |
| | |
| 坂本 文人 | 2004.10~12 (D1) | Argonne National Laboratory (USA) |
| | |
| 荻野 晴之 | 2004.10 (M1) | Seoul National University (South Korea) |
| | |
| 細貝 知直 | 2004.2~3 | LOA (France) |
| | |
| 中村 啓 | 2004~2008 | Lawrence Berkeley National Laboratory (USA) |
| 2003.1~3 (D1) | Lawrence Berkeley National Laboratory (USA) |
| | |
| 深澤 篤 | 2004.1~3 (D2) | Stanford Linear Accelerator Center (USA) |
| | |
| 大久保 猛 | 2003.10~2004.3 (D1) | University of Nevada (USA) |
| | |
| 渡部 貴宏 | 2003~2006 | Brokhaven National Laboratory (USA) |
| 1998.8 | Lawrence Berkeley National Laboratory (USA) |
| | |
| 木下 健一 | 1998~1999 (D1) | Argonne National Laboratory (USA) |