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According to Davis, the radiation was first detected by air particulate detectors aboard three helicopters located 60 miles away from the shoreline.
The helicopters were returning to the carrier from a relief mission to the quake and tsunami ravaged city of Sendai.
Detectors aboard the USS Ronald Reagan also sounded while it was located 100 miles north east of the Fukushima Daiichi Nuclear Power Plant. Low amounts of radioactive materials have been released into the atmosphere as plant officials desperately try to prevent a meltdown of the nuclear cores at two of the plant's reactors.