As evidenced by alternating Saint Louis fallout detections of Neptunium 239 and Iodine 133 + Xenon 133, Fukushima is cycling between a free flowing neutron rich criticality creating Neptunium-239 > Plutonium 239 and a neutron "poisoned" criticality where Iodine-133 > Xenon 133 is both the neutron poison and primary fallout product.
In essence it is a dance with the devil creating alternating fallout poisons. But as any dance with the devil, the risk is greatest when the tune changes. As ground water conditions change and the neutron poisoning influences of Xenon 133 wane, a too rapid conversion from neutron famine to neutron feast may yet lead to an explosive un-moderated re-criticality.
Those with more precise instruments possibly understand this devil's dance in the ground water with enough quantitative clarity to more precisely ascertain the risks and likely outcomes; but qualitatively for us, the dance to is to see which comes first Thyroid or Lung cancer.
Update 10/28/11 with a link to the source data for the 10/17/11 detection sample.
The data is a TXT file in a CSV format.
Link to the background radiation data for the 10/17/11 detection.
The data is a TXT file in a CSV format
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