Gammascout Alert detecting in microsieverts per hour (uSv/hr)
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Monitoring Station: http://sccc.org.au/archives/2630
Southern Hemisphere September 2017 Background Report. (27% above Average)
This short animation of Northern and Southern Hemisphere air circulation, shows why we can get detections so far south.
Caloundra September 2017 – In the last few months there has been a steady increase in month averages at this location in the Southern Hemisphere. The months have been very dry. The September rainfall total was 15mm and the wettest day was the 23rd, with 13mm. Radon levels have been low, so it did not contribute significantly to the day average increases we have seen through September.
I have been trying to work out why there has been an unseasonal increase in background here in winter, on top of the normal Fukushima increase.
So what created these recent increases?
Here are some theories.
1. There has been more mixing of Northern and Southern hemisphere tropical air flows, allowing more radiation from the Northern hemisphere to enter the Southern Hemisphere.
2. Research is showing that more cosmic rays are now reaching the Earth because the Sun’s heliosphere is decreasing in intensity.
(2017 chart of Cosmic Ray increases.)
This is part of a normal Sun cycle that occurs approximately every 420 years.
Could a significant part of the Winter background uptick here be from increased cosmic radiation and
by-products reaching the earth’s surface?
Cosmic ray muon creation in the upper atmosphere could also be a significant part of this increase.
If this is the case, we would expect there to be an uptick in background radiation detection by Geiger counters, even at the surface of the Earth.
Most people don’t go to the trouble of collecting day average and month average radiation background levels, using 60 second sampling. My system of data collection will show changes that would be missed by others.
3. The Monitoring Geiger Counter is malfunctioning.
I haven’t been able to find any evidence that this is the case. Ruled out the possibility of dust contamination as the area around monitoring counter was cleaned of dust, plus the Geiger counter was also inspected and cleaned of any dust build up. The background levels have continued to climb, even after the clean.
The GammaScout Geiger counter battery level is still at the normal operating 3.6 volts.
My conclusion at this point is that the increased cosmic ray activity, plus the Fukushima increase, are both contributing to the local background levels we are now seeing.
Caloundra September month average, year comparisons.
2017 27% above pre-Fukushima average
2016 12% above pre-Fukushima average
2015 5% above pre-Fukushima average
2014 5% above pre-Fukushima average
2013 15% above pre-Fukushima average
2012 13% above pre-Fukushima average
September day average chart,
Year and month average local background radiation levels from 2007 to 2017.
Disclaimer: This is an amateur volunteer run service. Human error can provide incorrect information, and equipment malfunction can produce false readings. Do not rely on, or take action upon information presented here, without further research.