نتایج جستجو برای: radiocarbon dating

تعداد نتایج: 18604  

2009
Paul W. Staten Thomas Reichler

[1] The abundant atmospheric data provided by radio occultation (RO) via the Global Positioning System satellite network have improved short and long-term forecasts and have demonstrated the potential to provide a long-term, consistent, and independent climate dataset. Previous studies have already verified the consistency and reliability of the RO method, listing a range of precision estimates...

2017
Penelope L. King Ulrike Troitzsch Tristen Jones

This data article contains mineralogic and chemical data from mineral coatings associated with rock art from the East Alligator River region. The coatings were collected adjacent to a rock art style known as the "Northern Running Figures" for the purposes of radiocarbon dating (doi:10.1016/j.jasrep.2016.11.016; (T. Jones, V. Levchenko, P.L. King, U. Troitzsch, D. Wesley, 2017) [1]). This contri...

1997
Donna L. Kirner Richard Burky R. E. Taylor John R. Southon John R. SOUTHON

2012
Kevin Kiernan Anne McConnell Eric Colhoun Ewan Lawson

KIERNAN, K., MCCONNELL, A., COLHOUN, E. & LAWSON, E., 2002 Radiocarbon dating ofmumiyo from the Vestfold Hills, East Antarctica. Papers and Proceedings o/the Royal Society o/Tasmania 136: 141-144. ISSN 0080-4703. School of Geography and Environmental Studies, University of Tasmania, Private Bag 78, Hobart, Tasmania 7001, Australia (KK*, AMc); Department of Geography and Environmental Science, U...

2012
Eric A. Calhoun

Radiocarbon dating of Late deposits has shown that erosion of old organic materials and their redeposition in younger sediments ages that are too old. Also, the humid climate and leaching pedogenic environment of much of Tasmania translocation humic acids down profile through porous sediments. The humic acids may then be perched by impermeable clay or may be adsorbed/ absorbed by older clay and...

2014

Nuclear physics is the field of physics that studies the constituents and interactions of atomic nuclei. The most commonly known applications of nuclear physics are nuclear power generation andnuclear weapons technology, but the research has provided application in many fields, including those in nuclear medicine and magnetic resonance imaging, ion implantation in materials engineering, and rad...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Heather D Graven

Radiocarbon analyses are commonly used in a broad range of fields, including earth science, archaeology, forgery detection, isotope forensics, and physiology. Many applications are sensitive to the radiocarbon ((14)C) content of atmospheric CO2, which has varied since 1890 as a result of nuclear weapons testing, fossil fuel emissions, and CO2 cycling between atmospheric, oceanic, and terrestria...

2016
Xinxin Zuo Houyuan Lu Jianping Zhang Can Wang Guoping Sun Yunfei Zheng

Phytoliths can occlude some organic carbon during their deposition in plants. This carbon fraction is recognised as an ideal dating material because of its high resistance to decomposition and post-deposition contamination at the time of phytolith formation. However, the reliability of phytolith radiocarbon dating has recently been questioned. The development of a new extraction protocol for ph...

2005
Torben C. Rick René L. Vellanoweth Jon M. Erlandson

Archaeologists have long recognized the problem of the ‘‘old wood’’ effect in radiocarbon dating charcoal and wood samples, the age of which may be hundreds of years older than their use by humans. Such problems have resulted in significant changes in how most researchers select wood and charcoal samples for C dating, with many now using relatively short-lived carbonized materials for dating. D...

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