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Published on Sep 13, 2011
Geiger counter with a Russian SBM-20 (СБM-20) tube.
On every count the blue led flashes and the buzzer beeps, after five counts the white led turns on and after ten the red led. Some counts are to fast in a row for the blue led or the buzzer. So I decided to use the decade counter 4017.
The test material is a gas mantle (Glühstrumpf) which I bought in 2011. I have never expected it that radioactive. It contains some Thorium dioxide (ThO2).