Carbon dating has a certain margin of error, usually depending on the age and material of the sample used.
Carbon-14 has a half-life of about 5730 years, and therefore it is used to date biological samples up to about 60,000 years in the past.
Is Carbon Dating Reliable? carm
Beyond that timespan, the amount of the orinal C formed by irradiation of nitrogen by neutrons from the spontaneous fission of uranium, present in trace quantities almost everywhere.The level of atmospheric Radiometric dating in general, of course, poses a huge problem for people who believe that the universe is 6000-odd years old.
JoyAnn Lindsey - IMDb
For these samples, other dating methods must be used.
Carbon dating costume:
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