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The most common isotope is carbon-12 (or 12C), which (according the article) makes up 98.89 percent of the naturally occurring carbon.
There's carbon-13, or 13C, which is much rarer, accounting for only 1.11 percent, and then there's carbon-14, or 14C, which makes up a ridiculously tiny fraction of existing carbon. Living organic matter will have steady and predictable concentrations of each isotope of carbon, pretty much the percentages mentioned above. After something dies, the 14C decays over time (because it is radioactive) and doesn't replenish as it would in a live specimen because the dead thing isn't eating and breathing or otherwise exchanging molecules with the outside world anymore).
The history of radiocarbon dating goes back to 1949, where it was introduced to the world by Willard Libby.
Radiocarbon dating is technique that uses the decay of carbon-14 to estimate the age of organic material.
The strength of yahoo because God has always been several examples accurate measuring the great volcanic eruptions add measurably to tell how it escape but she has half life.You then take a gallon of that diluted mixture and add another gallon of pure water to it 5,568 years later.The concentration of blue dye is cut in half again.Radiocarbon dating is used to determine the age of previously living organisms.Radiocarbon dating can be done at a variety of research institutions including Woods Whole and UC Irvine.