William Broad reports in the New York Times that crew members on the US aircraft carrier Ronald Reagan, sailing in the Pacific, “passed through a radioactive cloud from stricken nuclear reactors in Japan.” Crew members got a month’s worth of radiation in about an hour. US helicopters flying missions about 60 miles away from the stricken nuclear reactors “became coated with particulate radiation that had to be washed off.” Officials say the radioactive plume currently poses no risk to the US.