3D visualization of air-dose rate of working spaces by Digital Twin

Koizumi, Kenji ; Suzuki, Masahiro ; Aoki, Kazuhisa; Yamada, Susumu  ; Kim, M. ; Suzuki, Kenta ; Abe, Fumiaki  ; Machida, Masahiko  ; Okamoto, Koji

In the 1F decommissioning, it is crucial to improve the environment of working spaces inside the reactor building. One of the most essential ones is to reduce the exposure of workers as much as possible by utilizing advanced safety planning and designing tools. JAEA has so far developed a digital software tool to reveal 3D distributions of air dose rates and perform virtual simulations to reduce worker's exposure inside working places. A core part is to inversely estimate radiation-source spatial distributions and their magnitudes even in limited monitoring results using a machine learning technique called LASSO. By measuring the point cloud data and air dose rate data using measuring devices mounted on remote-controlled robots, 3D distributions of the obtained contamination can be displayed, and decontamination evaluation and safety analysis for worker exposure reduction can be performed without radiation exposure on virtual digital space.