Evacuation sites examined for absorbed dose rates in the indoor and outdoor air in the Fukushima Prefecture.

<p>Evacuation sites were 21–64 km from F1-NPS, and the buildings were aluminum-related (blue), reinforced concrete (yellow), and wooden (green) constructions. The map was generated using GPS data from each site. Markers of G1–G3 are explained in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0101650#pone-0101650-g002" target="_blank">Figure 2</a>.</p

Environmental half-lives of outdoor radioactive molecules at each evacuation site.

<p>Environmental half-lives (HFs) at cities of evacuation sites G1–G3 (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0101650#pone-0101650-g001" target="_blank">Figure 1</a>) were calculated using the least squares method with the obtained data;</p>a<p><i>p</i><0.01 vs. early stage (15–31 March) of HFs at G2 and G3;</p>b<p><i>p</i><0.05 vs. early stage of HFs at G3;</p>c<p><i>p</i><0.05 vs. delay stage (April–July) of HFs at G3, and <i>^dp</i><0.05 vs. delay stage of HFs at G3; by Tukey–Kramer's test.</p

Dose reduction efficiencies at evacuation sites northwest of F1-NPS.

<p>A 3 dimensional representation of time variations, distances from F1-NPS, and dose reduction efficiencies at 8 evacuation sites northwest (gray) of F1-NPS is shown [A]. Sites with reinforced concrete construction were measured 27 times after the accident [B]. Sizes of spheres (red) reflect dose reduction efficiencies.</p

Dose reduction efficiencies of gamma radiation in cloud or deposited radioactivity from the Fukushima Prefecture.

<p>Means ± S.E. of dose reduction efficiencies of wooden, aluminum, and reinforced concrete buildings were calculated 4 times on different days at 1 site, 15 times on different days at 3 sites, and 56 times on different days at 14 sites during March–July 2011.</p>a<p><i>P</i><0.05 vs aluminum building and reinforced concrete construction by Tukey–Kramer's test.</p

Dose reduction efficiency of G1–G3 sites (Figure 1).

<p>Data were calculated between March 2011 and July 2011. G1, G2, and G3 sites were measured 11, 21, and 10 times, respectively, on different days.</p

Variations in absorbed dose rates in the air immediately after the accident at F1-NPS.

<p>Dose rates in air were analyzed and calculated until July 2011 at G1, G2, and G3 sites (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0101650#pone-0101650-g001" target="_blank">Figure 1</a>). G1–G3 sites were measured 11, 21, and 10 times, respectively, on different days. The Nuclear Regulation Authority (NRA) data for each city are shown with lines (red: Fukushima city, blue: Koriyama city, light blue: south area of Minami-soma city), and values measured by our team are shown with circles. Solid and open circles represent outdoors and indoors, respectively.</p

Cumulative individual radiation dose accumulated daily.

<p>The survey teams have started measuring our departure from Hirosaki.</p

Contribution of radionuclide to dose rate estimated on expressway from Fukushima Prefecture to Aomori Prifecture.

<p>*FNPS: Fukshima Dai-ichi Nuclear Power Station.</p

The incidents occurred in the Fukushima Dai-ichi nuclear power station.

<p>The incidents occurred in the Fukushima Dai-ichi nuclear power station.</p