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https://petertodd.org/2014/push-button-rng

Much simpler and easier. Also more secure, as it's harder for a wiretapper to observe a button press than a Geiger counter.

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Shout out to that one guy who put an americium pellet over the lense of a webcam and used that as an entropy source. (Sorry, I can't find the URl to the page.)

Related, but different: https://github.com/epitron/webcam-rng