منابع مشابه
Ams Measurement of Atmospheric Co2 at Llnl
Development of radiocarbon analysis with precision better than 2‰ has the potential to expand the utility of CO2 measurements for carbon cycle investigations as atmospheric gradients currently approach the typical measurement precision of 2–5‰. The accelerator mass spectrometer at Lawrence Livermore National Laboratory (LLNL) produces high and stable beam currents that enable efficient acquisit...
متن کاملDental tribology at the microscale
Dental wear caused by tooth care is a complex phenomenon that depends on the quality of the tooth material, the type of toothbrush and the brushing slurry. Tooth wear is commonly determined in abrasion experiments using a standardized toothbrush in contact with a radioactively labeled dentin sample (RDA method). The increase of radioactivity in the slurry is a direct and highly-sensitive indica...
متن کاملInfluence of increasing combustion temperature on the AMS 14C dating of modern crop phytoliths
Several attempts have been made to directly date phytoliths, but most (14)C results are not consistent with other independent chronologies. Due to the limited dataset, there is not a clear explanation for these discrepancies. Herein, we report the (14)C ages of phytolith-occluded carbon (PhytOC) from contemporary rice and millet crops that were combusted at different temperatures to investigate...
متن کاملAMS 14C dating of Holocene estuarine deposits: consequences of high energy and reworked foraminifera
Benthic foraminiferal species were used to AMS date Holocene sediments adjacent to transgressive overlap boundaries (TOB) in two high energy estuaries in North Spain. It had previously been recognised that the foraminifera could be divided into indigenous and exotic components. Whereas it was known that the exotic forms had been transported into the estuaries from the adjacent inner shelf, it w...
متن کاملCorrelating the Ancient Maya and Modern European Calendars with High-Precision AMS 14C Dating
The reasons for the development and collapse of Maya civilization remain controversial and historical events carved on stone monuments throughout this region provide a remarkable source of data about the rise and fall of these complex polities. Use of these records depends on correlating the Maya and European calendars so that they can be compared with climate and environmental datasets. Correl...
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ژورنال
عنوان ژورنال: Radiocarbon
سال: 1997
ISSN: 0033-8222,1945-5755
DOI: 10.1017/s0033822200017902