Neat. While there are a bunch of Geiger counter RNG kits you can get, I appreciate the author's thoroughness.

I will say, one thing that's unclear to me from the write up(s), is how the author implemented the logic for deciding an individual bit value. The typical way folks do this (with a geiger counter), is to measure three events per bit (although you could potentially optimize this in a sequence). With 3 events, you then have two durations, the time between events 0 and 1, and events 1 and 2. Based on which duration is longer decides the value of the bit.