May 5, 2018 at 8:44 pm Log in to Reply
Southern Hemisphere April 2018 Background Level Report
Read below, or view entire Southern Hemisphere April 2018 report, plus charts and screens shots at CafeRadLab on one page here.
This short animation of Northern and Southern Hemisphere air circulation, shows why we can get detections so far south.
This month the GammaScout Geiger Counter used for data logging local background, developed a fault. I managed to get it working again, but in the process lost some day average logging data, hence the gap in the chart.
April month averages tend to vary from year to year by a significant amount. As the Southern Hemisphere winter approaches, air flows here swing a lot between Northern Tropic air to Southern Ocean air flows. If we get more tropical air in April the background goes up. If there are more Southern Ocean air flows, the month average goes down. Since Fukushima, this has become a dynamic of the local background monitoring. If you look at the charts on the yearly average background page, link below, you can clearly see an annual winter background dip showing up in the year and month background charts.
May 5, 2018 at 8:45 pm Log in to Reply
April 2018 day average background chart,
Caloundra April month average, year comparisons.
2018 24% above pre-Fukushima average
2017 11% above pre-Fukushima average
2016 33% above pre-Fukushima average
2015 6% above pre-Fukushima average
2014 22% above pre-Fukushima average
2013 9% above pre-Fukushima average
2012 12% above pre-Fukushima average
Cairns April Report – Fairly level, without any spikes. (Cairns has two monitoring Geiger counters.)
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.