Radioactive iodine has been found in the breast milk of four women living in Japan.

One woman, living in Kashiwa, Chiba Prefecture, contained 36.3 becquerels of radioactive iodine per kilogram.  Milk from two women in Tsukuba, Ibaraki Prefecture, contained 8.7 and 6.4 becquerels.

A citizens group paid for the analysts of the breast milk.  Currently there is no official limits for radiation levels in breast milk, in Japan.