Radiocarbon dating also referred to as carbon dating or carbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon. The method was developed in the late s at the University of Chicago by Willard Libby , who received the Nobel Prize in Chemistry for his work in It is based on the fact that radiocarbon 14 C is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting 14 C combines with atmospheric oxygen to form radioactive carbon dioxide , which is incorporated into plants by photosynthesis ; animals then acquire 14 C by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and from that point onwards the amount of 14 C it contains begins to decrease as the 14 C undergoes radioactive decay.
Carbon 14 Dating of Organic Material
Calculus I: Lesson Exponential Growth and Decay - Application Center
The first example deals with radiocarbon dating. The concept is kind of simple:. Every living being exchanges the chemical element carbon during its entire live. But carbon is not carbon. It consists almost on Carbon the stable nuclide but to a certain amount on Carbon, too.
Right now, 40, feet overhead, a cosmic ray is sending a neutron smashing into a nitrogen atom, smacking a proton out of its nucleus and forming an isotope called carbon Living things constantly consume carbon—through photosynthesis, for plants, and for animals, ingestion of those plants. The atmospheric ratio of carbon to regular carbon remains consistent at one part per trillion, so if something is alive, one-trillionth of its carbon atoms will be C But once a plant or animal dies, its carbon is no longer replenished. C is radioactive and unstable, with a half-life of 5, years, which means that half the atoms will turn back into nitrogen over that period.
In the s W. Libby and others University of Chicago devised a method of estimating the age of organic material based on the decay rate of carbon Carbon dating can be used on objects ranging from a few hundred years old to 50, years old. Carbon is produced in the atmosphere when neutrons from cosmic radiation react with nitrogen atoms :. Free carbon, including the carbon produced in this reaction, can react to form carbon dioxide, a component of air.