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The Old Wood Effect and the Carbon Exchange Reservoirs are just two well-characterized pitfalls for radiocarbon dating.
If unexpected results are received, please contact us immediately with concerns.
After ~40,000 years, less than 1% of the original 14C remains in a sample, reducing the precision of measurement.
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In situations where other radiocarbon laboratories have reported different results than those provided by Direct AMS, we will provide repeat processing and analysis, with additional consulting from archaeological/geological experts, at the standard service fee.