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Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

Fig. 3

Temporal change in atmospheric radioCs concentrations at the MRI before and after the FDNPP accident (“Mar.-Aug. 2014”). Activity concentration is expressed in milli becquerel per cubic meter on a logarithmic scale. The measurement uncertainty (1σ) is shown. The maximum concentration of 38 Bq/m3 of 137Cs was observed during March 20–21, 2011. After that, the radioCs concentrations rapidly decreased until fall 2011 when the decrease slowed. The levels before (approximately 1 μBq/m3) and 3 years after the FDNPP accident (12 μBq/m3 from March to August 2014) are also compared. A difference of at least one order of magnitude is observed between the concentration level from March to August 2014 and the level before the FDNPP accident

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