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Here are the counts per minute from two of my $20 Geiger counter kits, connected to a Raspberry Pi Zero W.
The Geiger counters are in my home, about 10 m apart. They are detecting background radiation, mostly gamma rays.
A cpm measurement is uploaded every 5 minutes, from the counts of the previous 5 minutes.
The plot is regenerated every hour. Normal background radiation is about 16 cpm. If you see a spike of about 70 cpm, it is due to a small sample
of uranium being placed near the Geiger counter. I calculate the Pearson correlation coefficient and the p-value for fun. More about that later,
if some significant correlation occurs...
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