Article History

development of children can be clarified and reported to a risk management bureau, appropriate risk management steps, such as self-imposed restraints, examination chemical compound control, and the implementation of environmental quality standards in water and soil, can be applied. Methods Investigation scale: 100 000 pregnant mothers and their children from across Japan (we plan to enrol 6840 pregnant mothers from Fukushima City, South Soma City, and Futaba County). Investigation period: 16 years (3 for recruitment, 13 for tracking) commencing 31 January 2011. Results and Conclusion Recruitment number and rate in a half year will be presented. The prospects of Japan Eco & Child Study in Fukushima will be also described in presentation. It is important to discuss the problems on long term study.