(a) As a part of “Environmental Dynamics studies,” radioactive material surveys are performed across areas, from forests and rivers to sea areas, and the results are used to develop prediction models of the transport of radioactive material and systems for assessing exposure doses. (b) As a part of the “Development of environmental monitoring and mapping techniques,” techniques for measuring radiation dose distribution using unmanned aerial vehicles and walking surveys are being developed. The results are used to develop a simulation system for assessing exposure doses.