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Progress in Earth and Planetary Science
Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

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

Fig. 2

Monthly 90Sr and 137Cs deposition levels in pre- and post-accident periods. Partial enlargement of Fig. 1. The monthly deposition is expressed in millibecquerel per square meter on a logarithmic scale. The atmospheric depositions of 90Sr and 137Cs in 2013 observed at the MRI were a few orders of magnitude higher than those from 2005 to 2011 before the FDNPP accident. For 90Sr and 137Cs, monthly depositions during 2005 to 2010 were 0.5–19 mBq/m2/month and 1.2–97 mBq/m2/month, whereas they were 1–33 mBq/m2/month and 2–39 Bq/m2/month in 2013, respectively

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