Officials with Fukushima Prefecture announced they found the source contaminating beef cattle: Radioactive hay.

It was initially reported that beef farmers were feeding their cows with feed that was kept indoors.  Turns out they were not.  Farmers admitted that they quickly ran out of feed that was kept indoors, and began feeding the cows hay from outside.

Since people don’t eat hay, no one had tested hay for radiation.  Now they have, and it tested positive for cesium contamination.  The local government safe limit is 300 becquerels per kilogram, the national safe limit is 500.

Officials are still testing local well water.