On May 8th 2011 the United States Department of Energy detected airborne Neptunium -239 in the wake of what was wildly reported on the blogosphere as a "Fire" at Fukushima. The Neptunium 239 was detected approximately 40 miles west-south-west of Fukushima at a rest area on the Tohoku Expy near Niita (see map below)
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Below is a video of the widely reported May 8th "Fire" at Fukushima Daiichi.
The DOE's airborne detection was made from approximately 38 cubic feet of air filtered through a carbon air filter. The Np-239 concentration was measured 1.49E-08 uCi/mL. Neptunium 239 quickly decays into Plutonium 239.
The source data may be found at US DOE/NNSA Response to 2011 Fukushima Incident: Radiological Air Samples
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