Carbon 14 used for dating
It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years old. Carbon-14 has a relatively short half-life of 5,730 years, meaning that the fraction of carbon-14 in a sample is halved over the course of 5,730 years due to radioactive decay to nitrogen-14.
The carbon-14 isotope would vanish from Earth's atmosphere in less than a million years were it not for the constant influx of cosmic rays interacting with molecules of nitrogen (NFigure 1: Diagram of the formation of carbon-14 (forward), the decay of carbon-14 (reverse).
Radiocarbon dating is used in many fields to learn information about the past conditions of organisms and the environments present on Earth.
Radiocarbon dating (usually referred to simply as carbon-14 dating) is a radiometric dating method.
The AMS can count all of the C-14 atoms in the sample resulting in increased sensitivity.
Before Radiocarbon dating was able to be discovered, someone had to find the existence of the C isotope.
Atomic bomb detonations since 1950 have boosted the amount of C-14 in the atmosphere and, as a result of this, a method has been devised to date recent samples.
C-14 is formed in the upper atmosphere by nuclear reactions initiated by neutrons in cosmic radiation ( and convert it to organic compounds, and in this way, C-14 becomes incorporated into living tissue.
Carbon dating has shown that the cloth was made between 12 AD.
Thus, the Turin Shroud was made over a thousand years after the death of Jesus.