Difference between chronometric dating relative dating


19-Feb-2015 07:21

Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element.These rates of decay are known, so if you can measure the proportion of parent and daughter isotopes in rocks now, you can calculate when the rocks were formed.

Each isotope is identified with what is called a ‘mass number’.

When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.



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