209po with a half life of 125 years has the longest half life of all isotopes of polonium. 1 there are many polonium 218 214 and 210 halos in granite. Polonium 218 3 05 minutes alpha lead 214 26 8 minutes beta gamma bismuth 214 19 9 minutes beta gamma polonium 214 164 microseconds alpha lead 210 22 3 years beta bismuth 210 5 01 days beta polonium 210.
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