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The method was developed in the late 1940s at the University of Chicago by Willard Libby, who received the Nobel Prize in Chemistry for his work in 1960.It is based on the fact that radiocarbon ( in a sample from a dead plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died.National Geophysical Data Center Radiocarbon datasets. C14-L is an email list for researchers and others involved in radiocarbon and other radioisotopes used in dating, and in scientific dating issues in general.Disciplines for which it should be of particular interest would include anthropology, archaeology, climate and environmental studies, dendrochronology, earth sciences, oceanography, and various branches of chemistry and physics.It is one of several similarly formed cosmogenic nuclides.Newly formed carbon-14 atoms oxidize to carbon dioxide and become thoroughly mixed with the other atmospheric gases, through atmospheric dynamics.Radiocarbon dating, also known as carbon-14 dating, is a radioactive decay-based method for determining the age of organic remains that lived within the past 50,000 years.Most carbon-14 is created from nitrogen-14 in the earth’s upper atmosphere as a consequence of cosmic ray bombardment.

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It has the same functionality as CAL25 but with a new user interface.. As described in: "Marine Radiocarbon Calibration Curve Spanning 0 to 50,000 Years B. Based on Paired 230Th/234U/238U and 14C Dates on Pristine Corals," by Richard G. Mortlock, Tzu-Chien Chiu, Li Cao, Alexey Kaplan, Thomas P. The program operates on the Google Earth and Google Map application engines and features overlay data sets particularly useful for interpreting the radiocarbon reservoir age estimates. Southeast Asia and Anatolia 14Sea Project: 14C database of Anatolia, the Aegean, and southeast Europe available in downloadable Excel files.

The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.

Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.

United States NOAA Earth System Research Library (ESRL) 14CO2 data and Carbon Dioxide Information Analysis Center (CDIAC) data.

National Geophysical Data Center Paleoclimatology Home Page.

One site, many major programs: CALIB, Marine Reservoir Correction, CALIBomb, Int Cal13, SHCal13, Int Cal09. This is an online radiocarbon calibration program with downloadable versions for Windows and Mac platforms.