Following up this article..Iodine 131 measured in Yamanashi
From March to April, Iodine 131 was measured from dried sewage sludge in Gunma and Chiba.
↓ Gunma
↓ Chiba
In Kawasaki, Iodine 131 has been measured since 5/13/2011.
They measured Iodine 131 from dried sewage sludge in Yokohama, on 4/3/2012.
Iori Mochizuki