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Radiocarbon formed in the atmosphere is dissolved in oceans in the form of carbon dioxide and contemporaneously assimilated by plants through photosynthesis and enters food chains.This is how terrestrial organisms take in carbon 14 in their systems.with just the global marine reservoir correction) and a 1000 /-30BP radiocarbon date with a Delta R of 222 /-35 and the global marine reservoir correction included.Freshwater systems running through limestone or fed by old water from springs can lead to falsely old ages in carbonate AMS dates.Actual correction varies with location due to complexities in ocean circulation.The database is also intended for use with radiocarbon calibration programs such as CALIB (Stuiver and Reimer, 1993) or Ox Cal (Bronk Ramsey 1995) using the 2013 marine calibration dataset.Marine organisms and those who consume them take in carbon 14 from the exchange process of carbon 14 (in the form of carbon dioxide) in the atmosphere and the ocean or any body of water.However, carbon 14 content is not the same at the surface mixing layers and that in the deep ocean; hence, not all marine organisms have the same radiocarbon content.
Depending on the age of the marine carbonate, a 200- to 500-year correction (i.e.Even if the organisms have the same age, they wouldn’t have the same carbon 14 content and would thus appear to be of different radiocarbon age. Surfaces of oceans and other bodies of water have two sources of radiocarbon – atmospheric carbon dioxide and the deep ocean.Deep waters in oceans get carbon 14 from mixing with the surface waters as well as from the radioactive decay already occurring at their levels.The basis of radiocarbon dating includes the assumption that there is a constant level of carbon 14 in the atmosphere and therefore in all living organisms through equilibrium.Carbon 14 is a naturally occurring isotope of the element carbon and is called radiocarbon. Another characteristic of carbon 14 is that it is continually being formed in the upper atmosphere as a product of the reaction between neutrons produced by cosmic rays and nitrogen atoms.
There are several factors that need to be considered because they affect the global concentration of carbon 14 and therefore that of any given sample for radiocarbon dating.