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The ratio of radiocarbon to stable carbon atoms in the atmosphere has varied in the past.
This is because the amount and strength of cosmic radiation entering the earth's atmosphere has varied over time.
The raw radiocarbon date of any sample can then be converted to true date by using this calibration table.
This calibration step eliminates any concern about fluctuations in historic radiocarbon to stable carbon ratios or decay rates.
Radiocarbon is not stable; over time radiocarbon atoms decay into nitrogen atoms.So by measuring carbon 14 levels in an organism that died long ago, researchers can figure out when it died.The procedure of radiocarbon dating can be used for remains that are up to 50,000 years old.Radiocarbon dating is a valuable tool to chronologists and archaeologists.It provides an objective, absolute method of determining a sample's age with quantifiable precision.