In the central city of Koriyama. Someone has uploaded a video which shows several points reading in the units of Bq/cm^2. The video uploader only shows one measurement in each area, but nonetheless extrapolates from cm^2 to m^2. That is not appropriate unless the entire m^2 is represented by the individual measurement and it's not clear that that is the case.
The YouTube uploader wants people to think that these levels are endangering the children, but they are very low. For comparison, the U.S. NRC's Reg. Guide 1.86 allows surfaces to be released from regulatory control if they average 5,000 dpm/100 cm^2 averaged over a square meter up to 15,000 dpm/100 cm^2 in any one 100 cm^2. These Koriyama readings exceed the maximum by up to 5 times, but they are nowhere near any kind of safety concern.
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