Kids definition radiometric dating
For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms.
Radiocarbon dating is one such type of radiometric dating.
All radiometric dating methods measure isotopes in some way.
Because of their unique decay rates, different elements are used for dating different age ranges.
This is different to relative dating, which only puts geological events in time Most absolute dates for rocks are obtained with radiometric methods.