Twelve high schools in Japan (of which six are in Fukushima Prefecture),
four in France, eight in Poland and two in Belarus cooperated in the
measurement and comparison of individual external doses in 2014. In
total 216 high-school students and teachers participated in the study.
Each participant wore an electronic personal dosimeter 'D-shuttle' for
two weeks, and kept a journal of his/her whereabouts and activities. The
distributions of annual external doses estimated for each region
overlap with each other, demonstrating that the personal external
individual doses in locations where residence is currently allowed in
Fukushima Prefecture and in Belarus are well within the range of
estimated annual doses due to the terrestrial background radiation level
of other regions/countries.