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Re:FTLAB FSG-001 – A $30 Geiger Counter for Android and iOS by hatsunearu on Saturday July 30, 2016 @11:51AM (#12193465)
If you're looking for some fun, you can reverse bias a zener diode and measure the noise that comes out of it. It's shot noise, and you can measure it quite easily with just some simple passives and an ADC.
Re:FTLAB FSG-001 – A $30 Geiger Counter for Android and iOS by gravypod on Saturday July 30, 2016 @12:11PM (#12193540)
Wow never thought of that, that's a good idea.

I'll give it a try.