Tatsuo Torii

Project Professor

Institute of Environmental Radioactivity Measurements and Forecasting Division, Monitoring Systems Development


Ph.D. in Engineering from Graduate School of Engineering, Osaka University.
My specialty is radiation measurement. In particular, I am studying the technology of visualization of radiation distribution and the factors that affect environmental radiation due to natural phenomena such as lightning activity.

Main Focus of Research

  • Development research on visualization technology of radiation distribution
  • Integrated research of radiation and position recognition technology
  • Measurement analysis of behavior of radioactive substances using natural nuclides
  • Clarification of behavior of high-energy radiation generated by thunderstorm/ lightning activity.

Fields of Research

Radiation measurement, environmental radiation, atmospheric electricity


Radiation imaging, inverse problem analysis, atmospheric radon, energetic radiation, relativistic runaway breakdown

Academic Society Memberships

Atomic Energy Society of Japan, Japan Society of Applied Physics Ionizing Radiation Division, Japan Geoscience Union (JpGU), American Geophysics Union (AGU)

Research Overview

I have been studying radiation measurement and radiation physics in the environment.
After the Fukushima Daiichi Nuclear Power Station (FDNPS) accident, I have been conducting research and development on aerial monitoring that measures the radiation distribution in Japan using helicopters and remote monitoring technology by unmanned helicopters, mainly in Fukushima Prefecture.
Recently, I have been conducting research for the purpose of three-dimensional imaging using Compton cameras in order to visualize the radiation distribution in the high dose-rate field inside the FDNPS.
I’m also conducting research on the generation behavior of high-energy radiation in the atmosphere caused by lightning discharges and thundercloud electric fields.

A few words

So far, I have explained about environmental radiation in various places through field measurements. After March 11, 2011, through airborne survey, I recognized the importance of promptly measuring and announcing the distribution of radioactive substances released into the environment due to the FDNPS accident. From now on, by visualizing the distribution of radiation, I will also carry out activities to disseminate it to society using various media so that people can feel nature and science and technology that are difficult to see directly, such as ionizing radiation.



Ph. D., Department of Communication Engineering, Osaka University


Master’s Degree, Department of Physics, Toyama University


Bachelor of Science, Department of Physics, Toyama University



Researcher, Safety Control Division, O-arai Engineering Center, Power Reactor and Nuclear Fuel Development Cooperation (PNC*)

*PNC was renamed to JNC (Japan Nuclear Fuel Cycle Development Institute), after that JAERI (Japan Atomic Energy Research Institute) and JNC were integrated and reorganized into Japan Atomic Energy Agency (JAEA).


Principal Scientist, Manager of Environmental Control Section, Tsuruga Headquarter, JAEA


Director, Department of Safety and Quality Assurance Management, Tsuruga Headquarter, JAEA


Senior Principal Researcher, Department of Partnership Operation of Environmental Remediation, Headquarters of Fukushima Partnership Operations, JAEA


Division Head, Remote System and Sensing Technology Division, Collaborative Laboratories for Advanced Decommissioning Science, JAEA


Specially Appointed Professor, Research Institute of Nuclear Engineering, Fukui University


Courtesy Faculty, Department of Chemistry and Physics, College of Arts and Science, Florida Gulf Coast University, FL, USA


Project Professor, Institute of Environmental Radioactivity, Fukushima University