Low radiation levels from Japan are being detected in Washington

Low radiation levels from Japan are being detected in Washington, but officials say there is no health risk at this time.
A Department of Health air monitor in Seattle has detected trace levels of radiation in connection with Japan's nuclear emergency. The small amounts of radioactive iodine are millions of times lower than levels that would be a health concern.
Despite these very small amounts, the state's overall background radiation levels haven't risen. The results are consistent with findings reported by federal and Canadian officials, as well as independent researchers.
As expected, because of the distance from Japan and air mixing, radiation reaching Washington is so diluted that officials say there is no health risk, making protective action unnecessary.
Health officials say people in Washington shouldn't take potassium iodide, also known as KI, because of what's happened in Japan. Only people who work in or around nuclear power plants during an emergency, or who live near such a plant and can't get away, should take KI.