Abstract
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.
Highlights
The Fukushima Dai-ichi nuclear power plant accident, which began in March 2011, released a significant amount of radioactive substances, contaminating Fukushima and surrounding prefectures [1]
Important in assessing the effect of radiation on the residents is to conduct personal dosimetry: One of the earliest reports was by Yoshida et al [4], who measured the individual doses of the medical staff dispatched from Nagasaki to Fukushima City from March to July 2011
The six Japanese schools outside Fukushima Prefecture were chosen by consulting the “Geological Map of Japan” (Fig. 2, a natural radiation level map published by the geological society of Japan [9, 10])
Summary
The Fukushima Dai-ichi nuclear power plant accident, which began in March 2011, released a significant amount of radioactive substances, contaminating Fukushima and surrounding prefectures [1]. Important in assessing the effect of radiation on the residents is to conduct personal dosimetry: One of the earliest reports was by Yoshida et al [4], who measured the individual doses of the medical staff dispatched from Nagasaki to Fukushima City from March to July 2011. They reported that the personal dose equivalent HP(10) ranged from 0.08 to 1.63 μSv/h, significantly lower than the ambient dose equivalent rate H∗(10) recorded by a monitoring station in Fukushima city which ranged from 0.86 to 12.34 μSv/h. In 2014, 95.57% of the 46,436 subjects were found to be below 1 mSv/y [5]1
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