RSS 1.0Radiocarbon, Volume 25 (1983)
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 25, Number 3 (1983)American Journal of Science, 1983-01-01
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Radiocarbon, Volume 25, Number 2 (Proceedings of the 11th International Radiocarbon Conference, 1983)American Journal of Science, 1983-01-01
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Radiocarbon, Volume 25, Number 1 (1983)American Journal of Science, 1983-01-01
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Notice to Readers and ContributorsAmerican Journal of Science, 1983-01-01
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Notice to Readers and ContributorsAmerican Journal of Science, 1983-01-01
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Notice to Readers and ContributorsAmerican Journal of Science, 1983-01-01
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Time History of Human Gallstones: Application of the Post-Bomb Radiocarbon SignalBomb-produced 14C is a valuable tool for studying rates of short-term processes involving carbon cycling. This study shows that bomb 14C is an excellent tracer of a biochemical process that takes place in the human body, namely the accretion of stones in the gallbladder. The methods developed for obtaining time histories of 14C/12C and 13C/12C in concentric layers from a large gallstone (30mm diameter) are reported. Formation times are assigned by matching the 14C/12C obtained from individual layers with those found for known-aged tree rings. Results show that the gallstone grew over a period of 10 years and seems to have lain dormant within the gallbladder for a period of 11 years. The average growth rate was 1.5mm/year.
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The Unreliability of 14C Dates Obtained from Buried Sandy PodzolsA test for the reliability of 14C dating of soil was made at two sites with buried, autochthonous, and in parts, allochthonous sandy podzols, dated either lithoand pedostratigraphically or palynologically. The differences between the age ranges obtained and the apparent mean residence times (AMRT) calculated from the 14C content of alkaline extracts from fossil soil layers and horizons lean in organic matter exceed 10,000 years, corresponding to a maximum contamination with recent carbon of up to 50 %. The use of correction factors for the apparent mean residence times of podzols is not valid, not even for climate zones, because these values have a broad scatter for the same profile.
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The Use of 14C in Natural Materials to Establish the Average Gaseous Dispersion Patterns of Releases from Nuclear InstallationsThe Harwell Low Level measurements been measuring a variety of natural materials close to United Kingdom nuclear installations measurements are made first, to establish the releases to the atmosphere of 14C as observed tree rings and second, to establish dispersion contours ed over extended periods. The main study area has been Cumbria, around the BNFL nuclear installation at Sellafield. 14C, which can be measured to good precision even at values close to the normal natural levels, provides a powerful technique for the provision of practical experimental values much wanted for theoretical dispersion models.
