The most suitable types of sample for radiocarbon dating are charcoal and well-preserved wood, although leather, cloth, paper, peat, shell and bone can also be used.Because of the somewhat short half-life of 14C, radiocarbon dating is not applicable to samples with ages greater than about 50,000 years, because the remaining concentration would be too small for accurate measurement.Thermoluminescence dating: this method is associated with the effect of the high energy radiation emitted as a result of the decay or radioactive impurities.
Researchers at the Desert Lab have found that a previously overlooked group of gastropods, termed "minute" because of their small body size ( for 14C dating, even in settings where highly 14C-deficient carbon is ubiquitous, demonstrates their potential for dating a variety of Quaternary sediments worldwide.
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January 2004 Radiocarbon Dating of Gastropod Shells Jeff Pigati, University of Arizona, Department of Geosciences Jay Quade, University of Arizona, Department of Geosciences Tim Shanahan, University of Arizona, Department of Geosciences C. For more information contact Jeff Pigati at [email protected]
Vance Haynes, Jr., University of Arizona, Department of Anthropology Gastropods are found today in a variety of environmental conditions, from marshes and wet meadows, to grasslands and high-elevation forests. Radiocarbon dating of minute gastropods and new constraints on the timing of late Quaternary spring discharge deposits in southern Arizona.
Their shells are abundantly preserved in diverse geological and archeological deposits, and could potentially be used in radiocarbon dating. Palaeogeography, Palaeoclimatology, and Palaeoecology v. Gastropod shell carbonate contains ~12% carbon by weight, but many taxa consume limestone and incorporate old carbon during shell formation. More information about this error may be available in the server error log.Radiocarbon dating: radioactive carbon decays to nitrogen with a half-life of 5730 years.In dead material, the decayed 14C is not replaced and its concentration in the object decreases slowly.To obtain a truly absolute chronology, corrections must be made, provided by measurements on samples of know age.