Fig.1-12　Time series of 137Cs concentrations in seabed sediments off the Ibaraki coast

Fig.1-12 Time series of 137Cs concentrations in seabed sediments off the Ibaraki coast

Fig.1-12　Time series of ¹³⁷Cs concentrations in seabed sediments off the Ibaraki coast

Starting in 2012 and continuing for the next two years, we collected 51 seabed sediment samples in coastal regions from Kitaibaraki City to Oarai Town in Ibaraki Prefecture, spreading approximately 50 km north to south and approximately 20 km offshore. ¹³⁷Cs radioactivity concentrations are indicated in 2012 (a), 2013 (b), and 2014 (c) by circle size. Thus, we could understand the distributions and time series of the ¹³⁷Cs radioactivity concentrations.

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