why is there still radioactive material on earth? Why hasn’t it all decayed?
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Throw a coin. If it’s heads it disappears. If tails it stays. Repeat indefinitely. It won’t be long until it’s gone right? Now do with 2 coins. It will last a little longer. Do it with 10 coins… 5kg of plutonium ^239 are 12.500.000.000.000.000.000.000.000 atoms. And you make a throw every 24.110 years (half life). It’s gonna be a while until it disappears. Francium 223 has the half life of 22 minutes, but it’s estimated that there’s still 1 kg in all the earth crust.
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