Radiometric age dating
Carbon-14 has two more neutrons than stable carbon, and thus has a mass that is greater by two.Carbon-14 is produced by a chemical reaction between stable Nitrogen atoms or ions and free neutrons in the atmosphere.It is especially disposed to dating minerals such as Zircon.
While this is an extremely trace amount, over time it is incorporated into the systems of most life forms.
Therefore, the amount of radioactive carbon in the system will only decrease and form Nitrogen.
Through experimentation it has been determined that Carbon-14 has a half-life of about 5,370 years.
Radiocarbon dating is so well-known because it can be applied to nearly any organism that was living at some time.
 While radiocarbon dating is very useful in cases where organic matter is being analyzed, in many cases the samples that are being dated were never alive.
While the overall method of Radiometric Dating is the same through each type, the specific isotopes that are used changes.