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Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter.
Each isotope is identified with what is called a ‘mass number’.
This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.
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When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.