[1J01-10] Dose Management

[1J03] Management of worker dose exposure associated with decontamination work

(3) Experience in worker’s dose exposure control

*Tomohisa Abe¹, Yukihisa Sanada¹, Masanori Tokiyoshi², Kyohei Nishiyama², Rina Sato³, Kazuya Yoshimura¹, Hironori Funaki¹, Mutsushi Ishida⁴, Haruo Nagamine², Motoyuki Fujisaka² (1. JAEA, 2. TAISEI, 3. Hitachi Solutions East Japan, 4. NESI)

Keywords:Fukushima Daiichi Nuclear Power Plant accident, dosimetry, Worker exposure control, difficult-to-return zone

We attempted to analyze in detail the actual external exposure doses of workers involved in decontamination work, which had been difficult to analyze in detail until now, by recording location information and exposure doses using GPS. As a result, it was found that more than 50% of the planned exposure dose calculated from the air dose rate and the number of actual working hours were more than twice the median the measured exposure doses. Furthermore, analysis by work type showed that the exposure doses of demolition workers tended to be higher. This information on the external exposure dose of workers linked to location information is useful for detailed analysis of external exposure factors and will contribute to the optimization of future radiation protection programs for workers.