Public Release from Goldschmidt Conference, Jun 26, 2016 (emphasis added): New research shows that most of the radioactive fallout which landed on downtown Tokyo a few days after the Fukushima accident was concentrated and deposited in non-soluble glass microparticles, as a type of ‘glassy soot’. This meant that most of the radioactive material was not dissolved in rain and running water… The particles also concentrated the radioactive caesium (Cs), meaning that in some cases dose effects of the fallout are still unclear… Japanese geochemists… analysed samples collected from within an area up to 230 km from the FDNPP… [I]t had been anticipated that most of the radioactive fallout would have been flushed from the environment by rainwater. However… most of the radioactive caesium in fact fell to the ground enclosed in glassy microparticles… [T]hese particles… formed during the molten core-concrete interaction inside the primary containment vessel in the Fukushima reactor units 1 and/or 3. Because of the high Cs content in the microparticles, the radioactivity per unit mass was as high as ~4.4×10^11 Bq/g [440,000,000,000,000 Bq/kg]… Analysis from several air filters collected in Tokyo on 15 March 2011 showed that 89% of the total radioactivity was present as a result of these caesium-rich microparticles, rather than the soluble Cs, as had originally been supposed.
Discovery (Seeker), Jun 27, 2016: Fukushima Accident Rained Glass Particles on Tokyo… Most of the radioactive fallout that descended upon downtown Tokyo in the days after the March 2011 accident [was] glass microparticles — essentially, glass-filled soot. As a result, the fallout, which contained concentrated radioactive cesium, wasn’t dissolved by rainfall, and probably lingered in the environment… Japanese scientists thought that most of it would be washed away by rainwater. Instead, analysis… revealed that most of the radioactive cesium in fact fell to the ground enclosed in glassy microparticles.
ANI, Jun 28, 2016: Research indicates Fukushima radioactive fallout may be worse than expected… Most of the radioactive fallout, which landed on downtown Tokyo a few days after the Fukushima accident, was concentrated and deposited in non-soluble glass microparticles, as a type of ‘glassy soot’…
Inverse, Jun 26, 2016: Radioactive “Glassy Soot” Fell Over Tokyo After the Fukushima Meltdown… The findings… show that the radioactive fallout… has been poorly understood. Previously, it was assumed that most of the radiation that fell dissolved in rain. This would mean that it would wash out of the soil and through the environment… These tiny glass particles entered the air and fell as soot on the surrounding region. Because the radioactive molecules are contained in an insoluble medium, they will not wash out of the soil with rainwater to the same extent… Beyond the consequences for the environment, there are significant consequences for human health. Breathing caesium encased in glass particles may have a very different impact from exposure to it as radioactive rain…
Scientists from Fukushima Univ., Japan Atomic Energy Agency, Stanford Univ., etc, June 2016: Cesium-rich micro-particles unveil the explosive events in the Fukushima Daiichi Nuclear Power Plant — Cesium-rich micro-particles (CsMPs) retain novel information on the molten core-concrete interaction… CsMPs specimens were discovered… in atmospheric particulates collected at Suginami, Tokyo… [Note: "The author has requested that this abstract is not discussed on social media."]
Dr Satoshi Utsunomiya, Kyushu Univ.: “This work changes some of our assumptions about the Fukushima fallout… This may mean that our ideas of the health implications should be modified“.
Prof. Bernd Grambow, Director of SUBATECH laboratory, France: “[The observations] presented here are extremely important. They may change our understanding of the mechanism of long range atmospheric mass transfer of radioactive caesium from the reactor accident at Fukushima to Tokyo, but they may also change the way we assess inhalation doses from the caesium microparticles inhaled by humans. Indeed, biological half- lives of insoluble caesium particles might be much larger than that of soluble caesium“.
Published: June 28th, 2016 at 12:46 pm ET