Abstract

The Great East Japan Earthquake on March 11, 2011 generated a series of large tsunami that resulted serious damage to the Fukushima Daiichi Nuclear Power Plant (FDNPP) and radioactive substances were discharged inside buildings of the FDNPP and to the environment. We are now developing remote radiation monitoring methods in high dose-rate fields in the buildings, besides the contaminated environment. In these measurements, we need evaluation technology of 2D/3D distribution of radioactivity in and around the buildings of the FDNPP. Furthermore, it is necessary that radiation-hard detectors that can measure remotely the shapes and nuclide distributions of residual debris inside the reactor pressure vessel and primary containment vessel. In this presentation, I will talk our research and development on this subject.