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How Does Radiometric Dating Work?, Ars Technica
The nuclide rubidium decays, with a half life of billion years, to strontium- Strontium is a stable element; it does not undergo further radioactive.
The isotope 14C is radioactive, and beta-decays with a half-life of 5, years. This means that in 5, years, only half of the 14C will remain, and after 11, years, only one quarter of the 14C remains. The best estimate from this dating technique says the man lived between and BC.
A potassium-argon method of dating, developed inmeasures the amount of 40Ar arising from the 40K decay and is compared to the amount of 40K remaining in the rock. The age of our galaxy and earth also can be estimated using radioactive dating.