Carbon isotope in radiocarbon dating
He first noted that the cells of all living things contain atoms taken in from the organism's environment, including carbon; all organic compounds contain carbon.Most carbon consists of the isotopes carbon 12 and carbon 13, which are very stable.More recently is the radiocarbon date of 1950 AD or before present, BP.There are two techniques for dating in archaeological sites: relative and absolute dating.Libby thus reasoned that by measuring carbon 14 levels in the remains of an organism that died long ago, one could estimate the time of its death.This procedure of radiocarbon dating has been widely adopted and is considered accurate enough for practical use to study remains up to 50,000 years old.A very small percentage of carbon, however, consists of the isotope carbon 14, or radiocarbon, which is unstable.
The extra neutrons in Carbon-14’s case make it radioactive (thus the term, radiocarbon).
For example, Christian time counts the birth of Christ as the beginning, AD 1 (Anno Domini); everything that occurred before Christ is counted backwards from AD as BC (Before Christ).
The Greeks consider the first Olympic Games as the beginning or 776 BC.
Radiocarbon is produced in the upper atmosphere after Nitrogen-14 isotopes have been impacted by cosmic radiation.
Radiocarbon is then taken in by plants through photosynthesis, and these plants in turn are consumed by all the organisms on the planet.