PORTLAND (CNN) - Radiation has now been detected in Oregon, the fifth state to be affected by Japan's damaged nuclear reactors.
State health officials and experts said there's nothing for the public to fear, however, as an air monitor in Portland picked up low levels of the radiation.
"All of the levels that they have been detecting would have to be hundreds of times higher to pose any minute threat to the public," said Dr. Eric Hansen, a radiation oncologist with Providence St. Vincent Hospital.
Hawaii, California, Colorado and Washington have all reported tiny quantities of radioactive material from Japan.
The Environmental Protection Agency said the radiation levels in each state fall below levels of concern.