Why do we use carbon 14 for carbon dating
Notice that the nitrogen-14 atom is recreated and goes back into the cycle.
The carbon-14 it contained at the time of death decays over a long period of time, and the radioactivity of the material decreases.
The technique used is called carbon dating, and in this lesson we will learn what this is and how it is used. Carbon dating, or radiocarbon dating, is a method used to date materials that once exchanged carbon dioxide with the atmosphere. In the late 1940s, an American physical chemist named Willard Libby first developed a method to measure radioactivity of carbon-14, a radioactive isotope.
Libby was awarded the Nobel Prize in chemistry for his work in 1960.
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