Source:
AOL/HuffpoThat radioactive fallout is turning up in food and water is hardly a surprise. Very low levels of radiation in the air connected to the Japanese plant have shown up coast to coast in the U.S., as well as in Iceland, Britain and Germany.
Most of the radioactive material disperses in the atmosphere, but some falls to the ground.
Radioactive iodine was found in the milk in California and Washington state, most likely after a cow ate tainted grass or drank puddles of rainwater containing it. Iodine-131, the type that was found, is short-lived and decays fairly quickly, becoming harmless.
Moulder said he wouldn't be surprised if leafy vegetables like spinach are next to show contamination, the source being rainwater. Again, the health risk "is about as close to zero as you can get," he said.
Read more:
http://www.huffingtonpost.com/2011/03/31/radiation-in-milk_n_843068.html