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

Environmental half-lives (HFs) at cities of evacuation sites G1–G3 (Figure 1) were calculated using the least squares method with the obtained data; ap<0.01 vs. early stage (15–31 March) of HFs at G2 and G3; bp<0.05 vs. early stage of HFs at G3; cp<0.05 vs. delay stage (April–July) of HFs at G3, and dp<0.05 vs. delay stage of HFs at G3; by Tukey–Kramer's test.