“The Food Lab,” for the latest International reports of radioactive food contamination.
This short animation shows Northern, and Southern Hemisphere air circulation. It clearly shows why we can get detections so far south. There is more equatorial barrier circulation break through during warmer months than winter.
Summary of Report
The storms passed over the Nimbin area on the 16th, and Caloundra area on the evening of the 17th, and early morning of the 18th. Rain swabs were collected from both these rain events, and analyzed.
1. The rain swab collected at Caloundra was tested and found to contain both the decay daughters of both Radon-222, and Radon-220. It is common to get Radon-222 washouts, not Radon-220. Radon-222 is from the Uranium decay chain, and Radon-220 is from the Thorium decay chain.
This theory has been put forward by a contact in New Zealand. The Radon-220 decay daughter isotope detection here, is an indication that one or more of the underground coriums at Fukushima undergoing fast neutron fission. One or more coriums are possibly purifying, and operating in a mode of unmoderated fission. This would increase the yields of Thorium daughters.
2. Trace amounts of longer lived isotopes for Iodine I-129, Uranium U-235, Be-7 and Lead Pb-210 where also detected. This is not good, but probably far less than areas in the Northern Hemisphere are getting as fallout.
3. Here are some other theories why large Radon washout events are becoming more common.
Some of the very large Radon washouts that are occurring in Nimbin area may be related to the geography of the location. Why we have concerns about large Radon washout events. http://www.radonseal.com/radon-health.htm
For more Technical details, charts and analysis, read on. (Comments, corrections, and suggestions are welcome)
"Alert Caloundra report 18th September 2013 – Storms overnight here, so I took rain swab off a car this morning. On testing it peaked at approximately 6 uSv/hr (1800 cpm) using two Russian SBM-20 tubes, and Theremino Geiger kit. Again it is suggested to stay out of the rain. This rain sample is decaying quickly which suggests it was a large Radon-222 washout."
This long period Geiger counter test chart indicated the presence of other Isotopes besides Radon-222 washout decay daughters.
Geiger Counter Test Chart
Explanation of Geiger Counter charts
This swab was placed in the scintillator lead chamber for further testing.
The main peaks are decay daughter isotopes of Radon-220, Lead Pb-212 (238 keV), X-ray at 77 keV, and Thalium Tl-208 (511, 583 keV), plus peaks for long lived isotopes of Iodine I-129, Uranium U-235, Beryllium Be-7, and Lead Pb-210. Because the rain swab scintillator test was started less than 24 hours after it was collected, there are some Radon-222 decay daughter isotopes of Lead Pb-214 and Bismuth Bi-214 also present.
Day average background levels have also been very volatile in this area for last 14 days, recently hitting 30% above the pre-Fukushima 4 year average.
September 2013 day average chart.
Alert Nimbin Monitoring Station report 16th September 2013 – Nimbin is located on the east coast of northern New South Wales Australia.
“…Rain began this morning…. drove to town about midday, got home about 30min ago and sat my SBT 10 on the roof of the car, as I gathered my things out of the back seat, and it started beeping. It was reading 0.38uSv/h….moments later I took a swab off the whole car roof (small sedan) and put it to my LND 7317 and got ~6500CPM for the first few minutes. I’ll send a photo and chart soon….”
Here is the decay chart and detection photo of this detection, kindly provided by the Ninbim radiation monitoring station operator.
NOTE: We haven’t seen any studies on the heath effects of being exposed to large Radon washout events like this. It is only a suggestion to take these precautions in the Rain Alert emails. If you live in the area, it is suggested to stay out of the rain during these events, plus keep children and pets out of it also. If you do get wet, have a good shower. It maybe a very large radon washout event, that seems to be common to the Nimbin area. This rain washout could also have other isotopes in it. Without further testing with better equipment, there is no way of knowing.
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. Views expressed in the pages or images on the SCCC Inc., site maybe the personal opinions of the relevant writers, and are not necessarily representative of those of SCCC Inc.