[MAXIMUM ALERT] Neptunium 239 Potentially Detected In Saint Louis 9/14/11 Radioactive Rainfall. Updates and video will follow shortly.
The source has a calculated average 2.4 day half life. The half life matches Neptunium 239. Np239 decays into Plutonium 239. The source would probably be Americium 243 created in the MOX fuel reactor at Fukushima Unit 3
Updated to add:
IF WE ARE LUCKY, the source will not be Americium 243 but rather Uranium 239 (in Fukushima); given the 2.4 day half life of Np 239, it is possible that source came directly across the jet-stream as Np-239. The result would be higher levels of Np-239 and Plutonium 239 the further west one went from Saint Louis.
The video below records raw data being taken from the 1.33 mR/hr radioactive rainfall which fell in Saint Louis, Mo on 9/14/11. This data was taken after shorter half life contamination had mostly burned off.
The data shown is from one hour total count readings taken of the radioactive source, and local background. The raw data from the later part of the video has yet to be fully analyzed.
UPDATE: 9/20/11 After taking considerably more data over a 120 hour period, the MAXIMUM ALERT remains in place. The longer half life fallout detect continues to bear the signature of Neptunium 239. See the updated blog video at
Longer Half Life Fukushima Fallout With a Neptunium 239 Signature Hits Saint Louis
STAY OUT OF THE RAIN!
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