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Yet few people know how radiometric dating works or bother to ask what assumptions drive the conclusions. This figure wasn’t established by radiometric dating of the earth itself. Radiohalos shouldn’t exist, according to conventional wisdom!
Though they are very tiny, polonium radiohalos have a huge message that cannot be ignored.
Each step in such a chain is characterized by a distinct half-life.
In these cases, the half-life of interest in radiometric dating is usually the longest one in the chain.
Third half-life (90 years total): The remaining 25 grams of Cs-137 decay and 12.5 grams are left.