Willard Libby, the inventor of radiocarbon dating, pointed out as early as 1955 the possibility that the ratio might have varied over time. ![]() ![]() Calibration is needed because the atmospheric 14Ĭ ratio, which is a key element in calculating radiocarbon ages, has not been constant historically. ![]() ![]() Radiocarbon dating measurements produce ages in "radiocarbon years", which must be converted to calendar ages by a process called calibration.
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