University students, concerned with the fact that there is no official government soil testing around the damaged Fukushima Daiichi nuke plant, took some samples of their own.

They found plutonium-239 and 240, making up a total of 0.078 becquerels per kilogram.  The samples were taken on 21 April 2011.  Immediately after they took the samples the Japanese government declared the area an evacuation zone.