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The diminishing levels via decay means that the effective limit for using c14 to estimate time is about 50,000 years. Subsequent work has shown that the half-life of radiocarbon is actually 5730 ± 40 years, a difference of 3% compared to the Libby half-life.

However, to avoid confusion all radiocarbon laboratories continue to use the half-life calculated by Libby, sometimes rounding it to 5570 years.

AMS technology has allowed us to date very small samples (such as seeds) that were previously undatable.

Carbon-14 is produced in the upper atmosphere when cosmic rays bombard nitrogen atoms.The ensuing atomic interactions create a steady supply of c14 that rapidly diffuses throughout the atmosphere.Plants take up c14 along with other carbon isotopes during photosynthesis in the proportions that occur in the atmosphere; animals acquire c14 by eating the plants (or other animals).Any organic material that is available in sufficient quantity can be prepared for radiocarbon dating.Modern AMS (accelerator mass spectroscopy) methods require tiny amounts, about 50 mg.




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