The first graph is from a lightning sensor, a small coil of wire inside the house that picks up the electromagnetic component of lightning. The range of this device is estimated at 20, maybe 40 miles. The sensing coil is oriented vertically so it is somewhat omnidirectional, and less sensitive than horizontally oriented coils. When a lightning storm approaches the counts per minute should read higher(20-100+ cpm) than normal (under 10) as you can see in the example graphs below. You can find a world map of lightning strikes here, or a midwest USA lightning map here.
The lightning sensor also picks up some local electrical noise (room light switched on, refrigerator motor starting, etc), so there is almost always some small reading (1-5 cpm) on the lightning/Noise graph. You may notice a sharp spike on an otherwise lightning free day, I probably did something in my electronics room where the sensor is located to cause that.
The second graph is readings from a background radiation monitor (simple Geiger Counter). What it measures is mostly Gamma rays, from various sources both here on earth and from space. Sensor is a common Soviet surplus SBM-20 Geiger Muller tube mounted inside a thin walled PVC pipe, on a wall about 1 foot above the first story roof at our home in Mineral Point, Wisconsin. This tube operates at 400VDC. You may view long term records of readings from this station on Radmon.
The third graph is another background radiation monitor using a different Geiger Muller tube, a SI-8G. This is a very large glass G.M. tube running at about 1300VDC. It measures about 14 inches long, two inches wide. Due to the size, this monitor will show much higher counts for the same background radiation. The two background monitors are only a few feet apart. This one is inside a window, about 3 inches from the glass window (and a steel fly screen) about 8 inches from the top of the same roof as the other monitor.
Radmon hosts a world map of background radiation readings. These readings are from individuals with radiation monitors similar to the one presented on this page. Some readings on the map will always be different from others because there are a variety of detectors being used, nothing is standardized between detectors. If you see a cluster of red dots, that may be some problem! One red dot may be a problem, more likely an issue with the monitoring station. Sometimes people perform experiments and forget to disconnect their monitor from the map, sometimes there are other issues."Cosmic Ray" Detector (not running at this time)
Sometimes, you may see a small rise in measured radiation when a thunderstorm is indicated in the lightning graph.
This is likely due to short-lived decay products from radon washing down from suspension in the air, not Fukushima or similar fallout. You can see several examples of this at the bottom of this page (click me).
In the first example, rain arrived as lightning peaked.
Lightning itself has no impact on measured radiation.
In this second example, only light rain arrived when lightning started, more rain came a short time later.
Another example. Rain came with the lightning, more rain after the lightning peak.
One of the highest lightning counts I had seen since setting this up. Pretty heavy and long rain after the lightning arrived. Radiation count bump about as high as I have seen for a rain event.
2020 August 10 had an even higher lightning count, 585CPM at one point! It was quite a storm, too bad it happened during daylight hours or it would have been fun to watch..
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