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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.
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.
Arizona AMS lab https://ams.arizona.edu/radiocarbon GNS Science AMS lab https:// Arizona Tree Ring Lab leave a comment at the bottom of the page to report errors or suggest links.) CALIB Home Page.
A., Kromer, B., Mc Cormac, G., van der Plicht, J., Spurk, M. INTCAL98 radiocarbon age calibration, 24,000-0 cal BP.
This can be overcome by calibration curves calculated by dating materials of precisely known age.
The best samples are tree rings, but annually laminated sediments have also produced excellent results. Chudy, Eristavi, Pagva, Povinec, Sivo, and Togonidze. Anthropogenic 14C variations in atmospheric CO2 and wines.
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.