In the second biggest Japanese city ,Yokohama (,where I live),a citizen detected 0.90 uSv/h beside a street gutter around Yokohama arena.(about 5 minutes by car from my apartment)
Having this result,Yokohama city government held an emergency press conference 9/17/2011.
For this press conference,Yokohama city government announced their radiation measurement result all of a sudden.
It reads,
- Sediment in a street gutter = 3,030Bq/Kg ～ 42,000Bq/Kg
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Sediment in the bottom of a water spout (stopped) = 35,000 Bq/Kg
-
Sediment beside the street plants = 11,320 ～ 27,600 Bq/Kg
They declared that they will keep measuring and considering how to decontaminate it, but no detailed plan was published.