By the time the radiation would reach Hawaii or the western coast of the united States, much of the radiation capable of causing harm to people would have left the atmosphere or turned into precipitation and have been "rained out," Masters wrote in his blog.
Following the 1986 Chernobyl disaster, a cloud of radiation traveled over Europe. The radiation diffused as it traveled by wind and did not cause harm. Those closest to the Chernobyl plant were the ones who suffered the effects of the radiation.
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ABC News' Martha Raddatz, Luis Martinez, Lauren Pearle, Sunlen Miller and The Associated Press contributed to this report.