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The atoms of some chemical elements have different forms, called isotopes.
These break down over time in a process scientists call radioactive decay.
He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.
The age of a rock can be calculated if its ratio of uranium to lead is known.
This is unstable and eventually decays to lead, which is stable.
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’.