Figure 4

Differences in radiocesium accumulations among the five regions between May 2011 and March 2014, i.e., after the F1NPP accident. Between May 2011 and March 2012, the highest total Cs concentration was found in the Sousou region. The second highest concentration was found in the Fukushima region, which was followed by the Koriyama and Aizu regions. Significantly higher total Cs, ¹³⁴Cs and ¹³⁷Cs concentrations were found in the Fukushima region compared to the other regions between April 2012 and March 2013 and between April 2013 and March 2014.