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#DIY #geigercounter #radioactive
DIY α, β, and γ sensitive Geiger counter I designed and built. The highest activity was shown by an old gas mantle containing thorium dioxide, which at that time was a commonly major component of the incandescent mantle, as it is also called. All the radioactive materials can be bought with no restrictions on eBay.
I also show how to convert cpm to µSvh.