EPA claims radiation found in rain in the United States as low risk as it tries to ease minds of the ongoing nuclear mess in Fukushima Japan. Time will tell if the public will feel betrayed by its government for not doing more to prevent illness and warn people to take counter measures to keep themselves safe from the harmful effects of plutonium, strontium, cesium and countless other radioactive nano particles.
I have been taking supplements like calcium, magnesium selenium, boron and potassium iodine to help prevent absorption of radioactive particles. Staying out of the rain is imperative. Not wearing shoes in the house, upgrading better carbon activated air and water filters for the ac unit and higher grade ac filters attached to box fans to filter out more of the air in the house. Changing food habits no fish, no seafood. Try to identify food labels and where the food comes from.