Survey Report on Personal Dose Equivalent and Indoor and Outdoor Staying Time for Children in the Southern Miyagi Prefecture after the Fukushima Dai-ichi Nuclear Power Plant Accident (Second Report)

A survey of personal dose equivalent for children using optically stimulated luminescent dosemeters has been carried out in the southern Miyagi Prefecture. The survey results for approximately one year from April or May 2013 are summarised in this report. The survey covered Marumori-cho, Shiroishi, Kakuda, and Oogawara-cho. The difference in the exposure dose among areas was not seen. No one who received annual doses in excess of 1 mSv was observed for 99 children, who had kept well wearing the dosemeter for the whole year. Maximum annual dose was evaluated to be 1.10 mSv, including the external radiation from natural radiation. Findings of indoor and outdoor staying time (home and school) for children were also reported. As for Kakuda and Oogawara-cho, school children stay at the inside of their houses and school 20.8 h a day in a total, so nursery children do 20.5 h. This results are much the same as those obtained for Marumori-cho and Shiroishi children in the first report.