scholarly journals Microwave Oven Pretreatment of Carbonates for 14C Dating by Accelerator Mass Spectrometry

Radiocarbon ◽  
1988 ◽  
Vol 30 (3) ◽  
pp. 385-387 ◽  
Author(s):  
David C Lowe ◽  
Gordon W Brailsford ◽  
Gregory W Drummond
Keyword(s):  
Mass Spectrometry ◽  
Convenient Method ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Microwave Oven ◽  
14C Dating

A microwave oven is used to pretreat carbonate samples prior to graphitization and radiocarbon dating by accelerator mass spectrometry. The method reduces the risk of contamination of small carbonate samples and provides a fast and convenient method for the acid evolution of CO2.

scholarly journals Correcting for Contamination in AMS 14C Dating

Radiocarbon ◽  
2002 ◽  
Vol 44 (2) ◽  
pp. 591-595 ◽  
Author(s):  
Ken Mueller ◽  
Paul Muzikar
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Chemical Processing ◽  
14C Dating ◽  
Two Stage ◽  
Carbon Contamination ◽  
Ams 14C Dating

When using accelerator mass spectrometry (AMS) for radiocarbon dating, it is important to correct for carbon contamination that is added to the sample and the standard during chemical processing. We derive an equation for making this correction that generalizes previous work in several ways. We treat the case in which contaminating carbon is added during both the combustion step and graphitization step. Taking this two-stage contamination process into account is particularly important when only a fraction of the CO2 produced in the combustion is graphitized. We also allow for the fact that the 13C fractions of the sample, the standard, and the contaminants may be different.

14C Dating of Soil Organic Carbon (SOC) in Loess-Paleosol Using Sequential Pyrolysis and Accelerator Mass Spectrometry (AMS)

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 563-570 ◽  
Author(s):  
Peng Cheng ◽  
Weijian Zhou ◽  
Hong Wang ◽  
Xuefeng Lu ◽  
Hua Du
Keyword(s):  
Mass Spectrometry ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Pyrolysis Temperature ◽  
Chemical Extraction ◽  
14C Dating ◽  
New Approach ◽  
Soc Fractions

The chemical extraction of soil organic carbon (SOC) fractions from soils often does not produce satisfactory results for radiocarbon dating. In this study, a sequential pyrolysis technique was investigated. The soil was pyrolyzed at temperatures of 200, 400, 600, and 800 °C to partition organic carbon into pyrolytic volatile (Py-V) and pyrolytic residue (Py-R) fractions. The preliminary results show that the 14C dates of both fractions become progressively older as the pyrolysis temperature is increased. In addition, the ages of the Py-V fractions are consistently younger than the corresponding Py-R fractions extracted at the same temperature. Experimental results of known-age paleosol samples indicate that the Py-V fractions obtained between 600 and 800 °C yield the most reliable ages. This technique provides a new approach to improve the accuracy of 14C dating of loess-paleosol sequences.

The Strange Case of the Ankhpakhered Mummy: Results of AMS 14C Dating

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1403-1408
Author(s):  
G Quarta ◽  
S Malgora ◽  
M D'Elia ◽  
V Gaballo ◽  
E Braione ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fourier Transform ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
14C Dating ◽  
Egyptian Mummy ◽  
Ams Radiocarbon Dating ◽  
Ancient Egyptian ◽  
The University ◽  
Ams 14C Dating

The ancient Egyptian mummy discovered in the wooden coffin of Ankhpakhered, priest of the god Min, has been studied at CEDAD (Centre for Dating and Diagnostics) at the University of Salento, Italy. The CT scan, performed by the multidisciplinary team of the Mummy Project of Milan, highlighted unusual features of the mummy, suggesting a reuse of the sarcophagus. Furthermore, specimens were taken via endoscopy for accelerator mass spectrometry (AMS) radiocarbon dating and Fourier transform infrared (FTIR) analyses, which have been carried out at CEDAD.

scholarly journals A Novel Approach for Developing High-Resolution Sub-Fossil Peat Chronologies with 14C Dating

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 455-463 ◽  
Author(s):  
T H Donders ◽  
F Wagner ◽  
K van der Borg ◽  
A F M de Jong ◽  
H Visscher
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
20Th Century ◽  
Accelerator Mass Spectrometry ◽  
Meteorological Data ◽  
Time Frame ◽  
14C Dating ◽  
Novel Approach

Sub-fossil sections from a Florida wetland were accelerator mass spectrometry (AMS) dated and the sedimentological conditions were determined. 14C data were calibrated using a combined wiggle-match and 14C bomb-pulse approach. Repeatable results were obtained providing accurate peat chronologies for the last 130 calendar yr. Assessment of the different errors involved led to age models with 3–5 yr precision. This allows direct calibration of paleoenvironmental proxies with meteorological data. The time frame in which 14C dating is commonly applied can possibly be extended to include the 20th century.

scholarly journals 14C Wiggle-Matching of the B-Tm Tephra, Baitoushan Volcano, China/North Korea

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 933-940 ◽  
Author(s):  
Shinya Yatsuzuka ◽  
Mitsuru Okuno ◽  
Toshio Nakamura ◽  
Katsuhiko Kimura ◽  
Yohei Setoma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
North Korea ◽  
Radiocarbon Dating ◽  
Gas Emission ◽  
Volcanic Gas ◽  
Ams Radiocarbon Dating ◽  
Eruption Age ◽  
The Difference ◽  
Volcanic Gas Emission

We performed accelerator mass spectrometry (AMS) radiocarbon dating and wiggle-matching of 2 wood samples from charred trunks of trees (samples A and B) collected from an ignimbrite deposit on the northeastern slope of the Baitoushan Volcano on the border of China and North Korea. The obtained calendar years for the eruption are cal AD 945–960 for sample A and cal AD 859–884 and cal AD 935–963 for sample B in the 2-σ range. These results are unable to determine the precise eruption age. The reason for the difference in reported ages may be due to volcanic gas emission prior to the huge eruption.

scholarly journals 14C Dating of Laser-Oxidized Organics

Radiocarbon ◽  
1993 ◽  
Vol 35 (2) ◽  
pp. 331-333 ◽  
Author(s):  
A. L. Watchman ◽  
R. A. Lessard ◽  
A. J. T. Jull ◽  
L. J. Toolin ◽  
Weston Blake
Keyword(s):  
Mass Spectrometry ◽  
Carbon Dioxide ◽  
Accelerator Mass Spectrometry ◽  
14C Dating ◽  
Ion Laser ◽  
Different Parts

We used a continuous krypton ion laser to rapidly oxidize milligram-sized fragments of coniferous driftwood of known ages, and dated the resulting carbon dioxide by accelerator mass spectrometry (AMS). AMS 14C ages of non-pretreated young wood from different parts of two logs were within 10% of the ages of conventionally determined alkaline insoluble fractions. The age of the oldest whole wood measured after laser oxidation was within the error ranges of conventional values.

scholarly journals A Protocol for Radiocarbon Dating Tropical Subfossil Cave Guano

Radiocarbon ◽  
2009 ◽  
Vol 51 (3) ◽  
pp. 977-986 ◽  
Author(s):  
Christopher M Wurster ◽  
Michael I Bird ◽  
Ian Bull ◽  
Charlotte Bryant ◽  
Philippa Ascough
Keyword(s):  
Mass Spectrometry ◽  
Southeast Asia ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Saturated Hydrocarbon ◽  
Lipid Fraction ◽  
Bulk Sample ◽  
Radiocarbon Dates ◽  
Organic Fractions ◽  
Age Determinations

We present accelerator mass spectrometry (AMS) radiocarbon dates on several organic fractions isolated from tropical guano deposits recovered from insular Southeast Asia. Differences were observed between 14C measurements made on bulk guano as well as bulk lipids, the saturated hydrocarbon fraction, solvent-extracted guano, and insect cuticles extracted from the same bulk sample. We infer that 14C dates from the bulk lipid fraction and saturated hydrocarbon fractions can be variably contaminated by exogenous carbon. In contrast, 14C measurements on solvent-extracted guano and isolated insect cuticles appear to yield the most robust age determinations.

scholarly journals Radiocarbon Dating of Fourteen Dead Sea Scrolls

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 843-849 ◽  
Author(s):  
Georges Bonani ◽  
Susan Ivy ◽  
Willy Wölfli ◽  
Magen Broshi ◽  
Israel Carmi ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Old Testament ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Dead Sea Scrolls ◽  
Dead Sea ◽  
Direct Information ◽  
Western Shore ◽  
The Dead

The name Dead Sea Scrolls refers to some 1200 manuscripts found in caves in the hills on the western shore of the Dead Sea during the last 45 years. They range in size from small fragments to complete books from the holy scriptures (the Old Testament). The manuscripts also include uncanonized sectarian books, letters and commercial documents, written on papyrus and parchment. In only a few cases, direct information on the date of writing was found in the scrolls. In all other cases, the dating is based on indirect archaeological and paleographical evidence. To check this evidence, radiocarbon ages of 14 selected scrolls were determined using accelerator mass spectrometry. The calibrated radiocarbon ages agree well, except in one case, with the paleographic estimates or the specific dates noted on the scrolls.

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