Fig. 9From: Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accidentRadioactive plume transport from the FDNPP accident in the Kanto Plain in March 2011. a On March 15 07JST and b on March 20 12JST. The figures show the simulated surface 137Cs concentration in shaded colors with the model topography in grayscale Back to article page