Limitations of radiometric dating
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Beta Analytic only provides Radiometric PLUS for charcoal, dung, peat, plants and seeds, shells, corals, and wood. AMS Dating – The AMS radiocarbon dating technique is suited for samples containing 0.00025 grams to 0.3 grams of final carbon.
Radiometric PLUS – Standard service is for samples containing at least 3.0 grams to 4.0 grams of final carbon (remaining carbon after all necessary pretreatments and chemical syntheses have been performed). Quoted precision generally ranges from 0.5% to 3% of the sample age and is independent of sample size.
Choosing the best method for radiocarbon dating depends on the quantity of available sample or, in the case of expensive materials, how much of it you can afford to be destroyed.
AMS dating, for example, involves burning a sample to convert it to graphite.
Familiar to us as the black substance in charred wood, as diamonds, and the graphite in “lead” pencils, carbon comes in several forms, or isotopes.