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Examples carbon dating used
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.
Carbon is found in different forms in the environment – mainly in the stable form of carbon-12 and the unstable form of carbon-14.
Over time, carbon-14 decays radioactively and turns into nitrogen.
Other radiometric dating methods such as potassium-argon or rubidium-strontium are used for such purposes by those who believe that the earth is billions of years old.
Radiocarbon is not suitable for this purpose because it is only applicable: a) on a time scale of thousands of years and b) to remains of once-living organisms (with minor exceptions, from which rocks are excluded).
Because atmospheric carbon 14 arises at about the same rate that the atom decays, Earth's levels of carbon 14 have remained fairly constant.
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Once an organism is dead, however, no new carbon is actively absorbed by its tissues, and its carbon 14 gradually decays.
The shells of live freshwater clams can, and often do, give anomalous radiocarbon results.
However, the reason for this is understood and the problem is restricted to only a few special cases, of which freshwater clams are the best-known example.
This is where you mention a person’s name or some other way of identifying the person to whom a command or request is being addressed.
Geologists do not use carbon-based radiometric dating to determine the age of rocks.