I’ve bought a relatively cheap KB6011 Geiger counter on Aliexpress.
You obviously want to test this thing. I’ve heard uraninite can be found here:
Příbram: 49.677N 14.060E & 49.643N 14.002E
Jáchymov: the Eva mine, and I think Barbora looks like another candidate
though you can find above-normal levels in ‘random’ places. I’ve measured something around 1 µS just walking around the Doubravka castle. A Czech article with more tips and information.
It’s fairly inconvenient to hold this up close to everthing. I found an unused piece of aluminium pipe, so I decided to make a Geiger stick. Later, when I realised that aluminium pipes are so cheap and easily available, I reprinted it for a 10 mm pipe, and found out 1 metre is too long.
The handle has the "grooves" 2 cm apart and it ended up working very well for my hand. In general it’s all surprisingly solid, considering the naïve design and low number of iterations.
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