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Radioactive Particles, Plus Southern Hemisphere May 2018 Background Level Report
#1
JAPAN

24th May 2018 – Fukushima radioactive particle release was significant says new research

Extracts:

In the immediate aftermath of the Fukushima Daiichi nuclear accident, it was thought that only volatile, gaseous radionuclides, such as caesium and iodine, were released from the damaged reactors. However, in recent years it has become apparent that small radioactive particles, termed caesium-rich micro-particles, were also released. Scientists have shown that these particles are mainly made of glass, and that they contain significant amounts of radioactive caesium, as well as smaller amounts of other radioisotopes, such as uranium and technetium

The scientists tested the new method on rice paddy soil samples retrieved from different locations within the Fukushima prefecture. The samples were taken close to (4 km) and far away (40 km) from the damaged nuclear reactors. The new method found caesium-rich micro-particles in all of the samples and showed that the amount of caesium associated with the micro-particles in the soil was much larger than expected.

https://phys.org/news/2018-05-fukushima-...icant.html

JAPAN

29th January 2018 – Uranium Dioxides and Debris Fragments Released to the Environment with Cesium-Rich Microparticles from the Fukushima Daiichi Nuclear Power Plant

Extracts:

We report, for the first time, the atomic-scale characteristics of nanofragments of the nuclear fuels that were released from the FDNPP into the environment. Nanofragments of an intrinsic U-phase were discovered to be closely associated with radioactive cesium-rich microparticles (CsMPs) in paddy soils collected ∼4 km from the FDNPP.

These results document the heterogeneous physical and chemical properties of debris at the nanoscale, which is a mixture of melted fuel and reactor materials, reflecting the complex thermal processes within the FDNPP reactor during meltdown. Still CsMPs are an important medium for the transport of debris fragments into the environment in a respirable form.

Article:

https://pubs.acs.org/doi/abs/10.1021/acs.est.7b06309

Comment:
These small very hot particles have been blown all around the world, and particularly in Japan. A number of tests have found these types of nano sized particles in household vacuum cleaner dust and air filters, in Japan.

Video: Airborne Radiation Spread

Talking Stick TV interview with Marco Kaltofen on how radiation spreads via airborne dust particles.





 
Southern Hemisphere May 2018 Background Level Report

Station location

http://sccc.org.au/monitoring/Australian-Map.jpg

This short animation of Northern and Southern Hemisphere air circulation, shows why we can get detections so far south.


http://www.youtube.com/watch?v=qh011eAYjAA

A nice quiet month without any significant background events. As most of the air flows here during this season come from a southerly direction, May local background levels were much lower than the summer months.

May 2018 day average background chart, (What the bar chart colour codes mean.)

[Image: Caloundra-local-average-background-radia...y-2018.jpg]

Caloundra May month average, year comparisons.

2018    12% above pre-Fukushima average
2017     7% above pre-Fukushima average
2016    12% above pre-Fukushima average
2015     4% above pre-Fukushima average
2014    13% above pre-Fukushima average
2013     7% above pre-Fukushima average
2012     7% above pre-Fukushima average


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