To express a radiocarbon date in calendar years it must be normalized, corrected as needed for reservoir effects, and calibrated. Radiocarbon dates can be obtained only from organic materials, and radiocarbons dating requirements archaeological sites offer little or no organic preservation. However, their association with cultural features such as house remains or fireplaces may make organic substances such as charcoal and bone suitable choices for radiocarbon dating.
A radiocarbon date on driftwood may be several centuries older than expected, because the tree may have died hundreds of years before it was used to light a fire. Charcoal from such roots may be the result of a forest fire that occurred hundreds of years after the archaeological materials were buried, and a radiocarbon date on such charcoal will yield an age younger than expected.
Dates on Bones Bone is second only to charcoal as a material chosen for radiocarbon dating. Indeed, it was believed, apparently by analogy with elemental charcoal, that bone was suitable for radiocarbon dating "when heavily charred" Rainey and Ralph, Dates on bone produced by such methods are highly suspect.
Ongoing research has continued to refine methods of extracting collagen, especially from small samples destined for AMS dating. Why do radiocarbon dates require calibration?
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Known as radiocarbon dating, this method provides objective age estimates for to detect the small amount of carbon that Libby's experiments required. At a very steady rate, unstable carbon gradually decays to carbon The ratio of these carbon isotopes reveals the ages of some of Earth's.