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Not all of the atoms of a radioactive isotope (radioisotope) decay at the same time.
Rather, the atoms decay at a rate that is characteristic to the isotope.
Isotopes have the same chemical properties, but different physical properties.
Y., reported today in the British journal Nature that some estimates of age based on carbon analyses were wrong by as much as 3,500 years.
All three isotopes have the same atomic number of 6, but have different numbers of neutrons.