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March 2018 Southern Hemisphere Background Level Report
Station location

[Image: Australian-Map.jpg]

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


The stats are in, and March 2018 had the highest recorded March background ever recorded here, at 46% above average. What is creating these increases? Fukushima atmospheric contamination? Increases cosmic rays? Radon releases, or combination of these?

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

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

Alert Caloundra 27th March 2018 - In the morning the GammaScout Geiger counter started to alarm on and off very quickly. One visual observation showed a spike of 0.625 uSv/hr. Looking at all the very short duration high detections I have been seeing recently, it suggests to me that I am detecting lots of hot particles in the atmosphere. If I didn't have 60 second sampling and a 0.30 uSv/hr alarm setting in place, I would probably have missed these detections. They would have been hidden in the averages, because they are of such a short duration.

A discussion on this event can be found here at CafeRad Lab (Link Below). Charts and other information on this detection are also provided.


Caloundra March month average, year comparisons.

2018    46% above pre-Fukushima average
2017    38% above pre-Fukushima average
2016    39% above pre-Fukushima average
2015    33% above pre-Fukushima average
2014    31% above pre-Fukushima average
2013    32% above pre-Fukushima average
2012    24% above pre-Fukushima average

Year and month average local background radiation levels from 2007 to 2018.


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 on this web site, without further research.
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