Epidemiologist John Boice did a superb job this morning on MSNBC tempering overreaction to radiation levels.
Dilution and dispersal of radioactive iodine moving away from the Japanese coastline keeps any impact minor.
Sensitive detection equipment in U.S. is picking up insignificant levels of iodine. For example, iodine levels in milk in the U.S. is 5,000 times below FDA standards.
None of this means that concern should not be directed to the workers at Fukushima.