Takatoshi Hattori is an Associate Vice President inCentral Research Institute of Electric Power Industry (CRIEPI), Japan. He received MSc (1986) and PhD (1996) degrees from Nagoya University and is working for CRIEPI since 1986. He was a chair of International Affairs Committee in Japan Health Physics Society (JHPS) andanEC member of AOARPuntil June 2019. He is a member of national expert committees for IAEA RASSC/WASSC/TRANSSC and is a leader of Health Physics and Environmental Sciencesection in Atomic Energy Society of Japan (AESJ). He is also a member of experts in the IAEA Consultancy Meeting on DS500 (Clearance)in the frame of the ongoing revision of the IAEA Safety Guide RS-G-1.7.