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For very radioactive debris the spent fuel origin might be possible. For most the condensed steam contaminants origin is probably the more likely. The isotopic composition of the radioactive contamination MIGHT be a tell. If it were skewed towards U235 and P239 that might favor the spent fuel origin hypothesis.  

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Mon Apr 25th, 2011 at 11:40:31 PM EST
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