The U.S. Department of Energy, and the Japanese Science Ministry, have put together a map of the fallout pattern of cesium.  The damaged Fukushima Daiichi nuclear plant has been spewing cesium.

The map shows the cesium fallout extends north west of the plant, in a large area. It is depicted with the colors yellow and red. NHK has a report.

Official say radiation levels from the Fukushima Daiichi plant have dropped enough that it is time to conduct more testing of soil for levels, and types, of radiation contamination.