Fig 1.
Study area and locations of the homes of study participants.
In the figure, circles, triangles, and rectangles represent the homes of subjects who participated in the individual external dose measurements once, twice, and three or more times, respectively. Ambient dose rates adjusted to as of September 28, 2013 are based on the 7th airborne monitoring survey conducted between August 27 and September 28, 2013. Maps created using ArcGIS 10.2 based on Digital Maps (Basic Geospatial Information) provided by Geospatial Information Authority of Japan.
Fig 2.
The “D-shuttle” (left) personal dosimeter and “i-gotU” (right) GPS receiver used in this study.
Fig 3.
Distribution of hourly individual doses obtained by D-shuttle from study participants.
Table 1.
Summary statistics for individual doses obtained using D-shuttle.
Fig 4.
Relationship between average additional individual external dose obtained using D-shuttle and average additional ambient dose estimated based on the 7th air-borne monitoring survey (left) and the relationship between RF (the ratios of individual external doses to ambient doses) and average additional ambient dose (right).
The first, second and third rows represent the results for data from the total study period, while at home, and while outdoors, respectively.
Fig 5.
Distribution of contributions of various activities to the total individual dose and the fraction of time spent in each activity.
Home: Time spent at home; In: Time spent inside buildings other than the home; Out: Time spent outdoors; Trans: Time spent in transportation; Oth: Unknown. In the box-and-whisker plot, the bottom and top of the box are the first and third quartiles, and the band inside the box is the median. Outliers are identified by asterisks.