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Materials such as charcoal, wood, peat, and textiles typically undergo the acid-alkali-acid (AAA) method before radiocarbon dating.

Carbon dating is a range of radioactive dating which is applicable only to matter which was once living and presumed to be in balance with the environment, taking in carbon dioxide from the air for photosynthesis.Natural contamination pertains to the introduction of contaminants to the sample by its surrounding material.For example, bone samples can be contaminated by the presence of limestone or organic acids in the soil (like humic or fulvic acids) where the bones were found.The Earth's atmosphere contains various isotopes of carbon, roughly in constant proportions.These include the main stable isotope (12C) and an unstable isotope (14C).

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