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Actually another question for you

Is there a theoretical limit on how many counts per minute the circuit can manage?

E.g. is 200,000 counts per minute possible? We are going to be using this against a caesium 137 source (for measuring the density of the material going through a pipe).

Great,

Thanks for the info. I'll give it a go and post the results!

Any tips for how to connect the geiger counter to the raspberry PI to access the raw counts? E.g. not through the serial port.

I would like to use the PI to read in the raw counts and bypass the Tiny chip completely if possible.