radiocarbon dating

noun

1. the determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content.

radiocarbon dating

noun

1. a technique for determining the age of organic materials, such as wood, based on their content of the radioisotope ¹⁴C acquired from the atmosphere when they formed part of a living plant. The ¹⁴C decays to the nitrogen isotope ¹⁴N with a half-life of 5730 years. Measurement of the amount of radioactive carbon remaining in the material thus gives an estimate of its age Also calledcarbon-14 dating

radiocarbon dating

1. A technique for measuring the age of organic remains based on the rate of decay of carbon 14. Because the ratio of carbon 12 to carbon 14 present in all living organisms is the same, and because the decay rate of carbon 14 is constant, the length of time that has passed since an organism has died can be calculated by comparing the ratio of carbon 12 to carbon 14 in its remains to the known ratio in living organisms.
2. Also called carbon-14 dating

Word History and Origins

Origin of radiocarbon dating¹

First recorded in 1950–55

A Closer Look

In the late 1940s, American chemist Willard Libby developed a method for determining when the death of an organism had occurred. 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. A very small percentage of carbon, however, consists of the isotope carbon 14, or radiocarbon , which is unstable. Carbon 14 has a half-life of 5,780 years, and is continuously created in Earth's atmosphere through the interaction of nitrogen and gamma rays from outer space. Because atmospheric carbon 14 arises at about the same rate that the atom decays, Earth's levels of carbon 14 have remained fairly constant. Once an organism is dead, however, no new carbon is actively absorbed by its tissues, and its carbon 14 gradually decays. 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.

Example Sentences

That’s based on radiocarbon dating of the remains of grass seeds buried in the layers of sediment above and below the tracks.

From Ars Technica

Improved radiocarbon dating techniques applied to remains of short-lived plant species unearthed at archaeological sites are also producing a chronology of Polynesian colonization close to that proposed in the genetic study, Lipo says.

From Science News

Hunter-gatherers have been coming to this place for around 12,000 years, according to radiocarbon dating of sediments on the cave floor.

From Popular-Science

The bones were too old for radiocarbon dating, which only works well on organic remains from the past 40,000 years or so.

From Singularity Hub 

The bone, just the fragment of a femur, comes from a dog that lived about 10,150 years ago, based on radiocarbon dating.

From Science News

Philon went on to explain the radiocarbon dating of the book.

From Project Gutenberg