"TOKYO—A prefecture just south of Tokyo said it had detected higher-than-permissible amounts of radioactive material in tea leaves, in a reminder that Japan's radioactive-contamination problems are far from over.
According to Kanagawa officials, a sample of tea leaves collected May 9 from the city of Minamiashigara, in the western part of the prefecture, was found to contain 550 becquerels of cesium per kilogram in the first test; the second test of the same sample detected 570 becquerels. The difference between the two readings is within the margin of error in such tests, the officials said." Full story here
The interesting thing is, you would never know from Kanagawa's official water readings.