So why does Iodine 131 'flip its coin' every eight days, vs, say, cesium-137 which 'flips its coin' every 30 years? What's the mechanism? Not to speak for palladin, but I think maybe that's really his question. If they flip once every 30 seconds, then the half life is 30 sec. What's the half-life? It depends on how frequently I call for the flip. Then we do it again, "1, 2, 3, flip!' and so on. Then I shout 'one, two, three, flip!' and they all flip. OK - suppose I get 1000 people in a room & give them each a coin.
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