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Krypton-85

Susanne Gerber

03.11.2011

“There was a “100-Fold Increase in Krypton-85 from November 1,” reports EX-SKF.

From TEPCO’s Nov. 2 press materials:

Comparison of testing done on Nov. 1 and Nov. 2 in Reactor No. 2′s primary containment vessel

Krypton-85 went from .0036 Bq/cm³ (3.6 x 10-³) to 0.53 Bq/cm³ (5.3 x 10-¹).

That is an increase of over 14,000% in one day.

One might wonder why Krypton-85 was chosen as an isotope to test for, when its half life is over 10 years.

Kr-85 on Nov. 1 @ .0036 Bq/cm³

Kr-85 on Nov. 2 @ 0.53 Bq/cm³

This would seem to make it not the best indicator of recent criticality because it lasts much longer than, for example, xenon-133, xenon-135 and iodine-131. However, according to a study published in the Journal of Environmental Radioactivity, “Krypton-85 is the best indicator for clandestine plutonium separations” when conducting wide-area atmospheric monitoring. Also, EX-SKF writes, “According to wiki, ‘About three atoms of krypton-85 are produced for every 1000 fissions (i.e. it has a fission yield of 0.3%)’. It sure looks like a nuclear chain reaction happening, i.e. re-criticality, the possibility of which TEPCO’s Matsumoto has already admitted.”

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Einsortiert unter:Fukushima, Radiation

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