No threat from Japanese radiation spread across U.S.

A detail from a EPA Rad Net air monitoring station is shown Thursday, March 24, 2011, in Portland, Ore. State physicists analyzing Portland air monitors have found traces of radiation in the air connected to leaks at Japan's damaged nuclear plants. The air monitors are picking up traces of iodine 131, but the radiation carries no health risk. State health officials in Oregon say the trace amounts of iodine 131 are consistent with the amounts being reported in California, Washington state and the west coast of Canada. The diffusion of the radiation from the 5,000-mile journey from Japan diluted the particles. State health officials say West Coast residents should not take preventative measures to combat the traces of radiation.(AP Photo/Rick Bowmer)