Some excerpts from the translation (Emphasis Added):
[...] Frankly, I am surprised that plutonium was detected [near Iwaki, 50km south of Fukushima Daiichi].
[...] the ratio of Pu239+240/Cs-137 is 9.0E-5, which is 200 times the government estimate of 4.3E-7, showing more plutonium being detected than the government estimate indicates. It is probably because of fractionation.
Right now, I am hoping to test for uranium, and Am-241 if possible.
Chris Busby discussed plutonium fractionation 11 months ago in relation to the explosion at Reactor No. 3:
Title: Nuclear criticality explosions in Fukushima due to plutonium fractionation and the consequences for health; some questions from a physical chemist
Source: LOW LEVEL RADIATION CAMPAIGN (llrc.org)
Author: Chris Busby
Date: 23 April 2011
Nuclear criticality explosions in Fukushima due to plutonium fractionation and the consequences for health; some questions from a physical chemist
[...] With regard to the nature of the explosion I make the following suggestion: the melting points and boiling points of plutonium and uranium oxides are not the same. The MP of plutonium oxide in MOX is 2701 degrees C but that of the Uranium oxide is 3120 degrees C (Popov et al 2000). Therefore when a mixture of these boils, there will be fractional distillation of the plutonium oxide, separation of the mixture, just as happens with alcohol distillation from alcohol water mixtures or the fractional distillation of crude oil. Thus plutonium will become concentrated in the vapour and in the nearest cooler areas were the vapour condenses. This would inevitably lead to a nuclear explosion when the concentration of plutonium exceeded the critical level for chain reaction. It is not only in MOX fuel that plutonium exists in nuclear reactors. It is produced as a result of the neutron irradiation of uranium fuel. [...]
Read the report here
Published: March 23rd, 2012 at 2:21 am ET
- Report: Plutonium ratio 200 times higher than gov’t says — Detection made 50km south of Fukushima Daiichi (RESULTS) March 22, 2012
- Expert: I think plutonium probably reached critical mass at Reactor 3 which caused explosion (VIDEO) September 6, 2012
- Japan Times: It is now a “grave situation” at Fukushima — “Plutonium fission” mentioned for first time — “Criticality is very likely to have occurred” November 3, 2011
- Group with SAM 940 isotope identifier detected high levels of Plutonium-239 near Iwaki a month after quake — 50km south of Fukushima Daiichi — Found at multiple locations (MAP & VIDEO) March 22, 2012
- Gundersen on Plutonium: I believe fragments of nuclear fuel are in the ocean — From explosions at Unit 3 AND Unit 1 (VIDEO) May 21, 2012