More recently, accelerator mass spectrometry has become the method of choice; it counts all the 14 C atoms in the sample and not just the few that happen to decay during the measurements; it can therefore be used with much smaller samples as small as individual plant seedsand gives results much more quickly. The different elements of the carbon exchange reservoir vary in how much carbon they store, and in how long it takes for the 14 C generated by cosmic rays to fully mix with them. Christie M, et al. Marine radiocarbon reservoir effects MRE in archaeology: Track course progress. See all examples of radiocarbon dating. Sign up here.
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Samples that have been radiocarbon dated since the inception of the method include charcoalwoodtwigs, seedsbonesshellsleather, peatlake mud, soilhair, potterypollenwall paintings, corals, blood residues, fabricspaper or parchment, resins, and wateramong others. Beta particles are products of radiocarbon decay. Also called carbon datingcarbon dating. Holt McDougal Modern Biology: Contamination is of particular concern when dating very old material obtained from archaeological excavations and great care is needed in the specimen selection and preparation. Research has been ongoing since the s to determine what the proportion of 14 C in the atmosphere has been over the past fifty thousand years.