Low-intensity radiation is random enough, but it's slow: your device is necessarily twiddling thumbs between a detected event and the next, and entropy is mostl

Low-intensity radiation is random enough, but it's slow: your device is necessarily twiddling thumbs between a detected event and the next, and entropy is mostly proportional to the number of events (for example, almost n bits from what of 2^n identical units is hit by the next particle).