Tests detected low levels of radioactivity on 17 U.S. Navy helicopter crew members when they returned to the USS Ronald Reagan
These were members of a rescue crew, who were most likely far closer to the incident than the ship itself.
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http://www.dailymail.co.uk/news/article-1366055/Japan-earthq...:
"The helicopters sounded the alert around 60 miles from the coast and the ship’s sensors also sounded when it was 100 miles north east of the plant."