Radiocarbon, Volume 30 (1988)
ABOUT THIS COLLECTION
Radiocarbon is the main international journal of record for research articles and date lists relevant to 14C and other radioisotopes and techniques used in archaeological, geophysical, oceanographic, and related dating.
This archive provides access to Radiocarbon Volumes 1-54 (1959-2012).
As of 2016, Radiocarbon is published by Cambridge University Press. The journal is published quarterly. Radiocarbon also publishes conference proceedings and monographs on topics related to fields of interest. Visit Cambridge Online for new Radiocarbon content and to submit manuscripts.
ISSN: 0033-8222
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Radiocarbon, Volume 30, Number 3 (1988)American Journal of Science, 1988-01-01
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Radiocarbon, Volume 30, Number 2 (1988)American Journal of Science, 1988-01-01
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Radiocarbon, Volume 30, Number 1 (1988)American Journal of Science, 1988-01-01
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13th International Radiocarbon ConferenceAmerican Journal of Science, 1988-01-01
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13th International Radiocarbon ConferenceAmerican Journal of Science, 1988-01-01
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Treatment of Discrepancies in Radiocarbon DatingA method is given for modifying the estimated radiocarbon dates of two samples when they are known to be in the wrong order.
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The Relations Between Carbon Isotope Composition and Apparent Age of Freshwater Tufaceous SedimentsThis paper presents a synthetic approach to 14C dating of calcareous tufa, based on statistical analysis of correlations betwen lithologic type of tufaceous sediment, carbon isotope composition, and apparent age. Experimental data on several profiles from southern Poland and the United Kingdom reveal either constant or systematically changing values of apparent age. Constant value of apparent age in a profile can be attributed to calcareous muds precipitated from stagnant or low-energy water, and to tufas precipitated from turbulent water (oncoids, stromatolites, moss travertines) which are characterized by lack of significant correlation between delta-13C and 14C age of tufa carbonate. It was found that the relation between the apparent age of tufaceous sediment and delta-13C value of tufa carbonate depends on lithologic type of tufa. Phenomenological equations describing the dependence of apparent age upon delta-13C are given, and applied to estimate true ages of tufas from Gliczarow (southern Poland) and Folkestone (United Kingdom).
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Small Sample 14C Dating by Liquid Scintillation SpectrometrySmall sample 14C dating is tested using conventional as well as high-resolution low-level liquid scintillation (LS) spectrometers. Contrasted are the results obtained dating -.25, 125 and 250mg of elemental carbon in standard size counting vials (3mL) and 0.3mL teflon and quartz vials. It is demonstrated that the improved performance of the 0.3mL counting vials enables just adequate resolution of 25mg and very good resolution of 100mg carbon samples both at Modern and Old age limits when the determination is made in a highresolution low-level LS spectrometer.
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Radiocarbon Dating of Holocene Calcareous Tufa in Southern PolandCalcareous tufa from five sites in southern Poland, representing several most typical conditions of tufa sedimentation, were chosen for 14C, 13C, and 18O measurements. These tufas were deposited in a high-energy turbulent stream (the Raerawka site), in streams with moderate but variable flow (Rzerzusnia and Trzebienice), and in semilimnic conditions (Sieradowice site). Sediments of the Gliczarow site represent spring travertines. In all but the latter site, direct comparison of 14C dates of carbonate and organic fractions was possible, leading to an estimate of initial apparent age of carbonate sediments. Clear correlation was found between the value of initial apparent age of tufas and the hydrodynamic conditions of sedimentation. Corresponding values range from ca 3900 yr (Raetawka) to 910 yr for semilimnic sediments (Sieradowice). Intermediate, almost identical values, equal to 2460 +/- 200 yr and 2100 +/- 160 yr, were obtained for tufas from Rzerzusnia and Trzebienice, respectively. Detailed sedimentologic classification of tufaceous deposits is presented and some primary and secondary factors affecting the accuracy of radiocarbon dates of various types of tufas are also discussed.