by paulindallas @ instructables.com:
Last Black Friday, the big sale day that comes right after Thanksgiving, I came across a sale on the Electronic Goldmine web site for a Geiger counter kit and tube for about $30. Now I always wanted to play with a Geiger counter, even as a kid back in the 50’s when Uranium, nuclear power, mutant radioactive ants (the movie “THEM” 1954) etc. were all the rage. I figured I was not getting any younger, so I bought it.
Arduino Mini Geiger Counter – [Link]