- 2024/04 - 現在 [Secondary appointment] Hokkaido University Graduate School of Health Sciences Visiting Professor
- 2021/07 - 現在 Central Research Institute of Electric Power Industry Biology and Environmental Chemistry Division, Sustainable System Research Laboratory Senior Research Scientist
- 2020/04 - 現在 [Secondary appointment] Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University, Japan Visiting Professor
- 2022/06 - 2024/03 [兼任] 北海道大学医学部保健学科 非常勤講師
- 2020/08 - 2024/03 [Secondary appointment] Kurume University School of Medicine, Japan Adjunct Lecturer
- 2018/04 - 2024/03 [Secondary appointment] Hokkaido University Graduate School of Health Sciences, Japan Visiting Scholar
- 2020/07 - 2021/06 Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Japan Senior Research Scientist
- 2010/04 - 2020/06 Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Japan Research Scientist
- 2014/03 - 2016/03 [Secondary appointment] International Commission on Radiological Protection (ICRP) Assistant Scientific Secretary
- 2009/07 - 2010/03 Space Radiation Research Unit, International Open Laboratory, National Institute of Radiological Sciences (NIRS), Japan Post Doctoral Research Fellow
- 2009/04 - 2009/07 Department of Pathology, Division of Pathophysiology, Institute of Development, Aging and Cancer (IDAC), Tohoku University, Japan Research Fellow
- 2007/10 - 2009/03 Department of Quantum Biology, Division of Bioregulatory Medicine, Gunma University Graduate School of Medicine, Japan COE Associate Professor
- 2005/10 - 2009/03 [Secondary appointment] Japan Atomic Energy Agency, Japan Research Collaborator
- 2005/08 - 2007/09 Department of Quantum Biology, Division of Bioregulatory Medicine, Gunma University Graduate School of Medicine, Japan COE Assistant Professor
- 2004/10 - 2005/09 [Secondary appointment] Japan Atomic Energy Research Institute, Japan Research Collaborator
- 2005/07 - 2005/07 Department of Quantum Biology, Division of Bioregulatory Medicine, Gunma University Graduate School of Medicine, Japan COE Research Associate
- 2004/10 - 2005/06 Department of Quantum Biology, Division of Bioregulatory Medicine, Gunma University Graduate School of Medicine, Japan COE Research Fellow
- 2004/04 - 2004/09 National Institute of Radiological Sciences (NIRS), Japan Post Doctoral Research Fellow