scholarly journals AMS 14C Dating at the Scottish Universities Environmental Research Centre (SUERC) Radiocarbon Dating Laboratory – Corrigendum

Radiocarbon ◽  
2016 ◽  
Vol 58 (1) ◽  
pp. 233-233 ◽  
Author(s):  
E Dunbar ◽  
G T Cook ◽  
P Naysmith ◽  
B G Tripney ◽  
S Xu
Keyword(s):  
Radiocarbon Dating ◽  
Environmental Research ◽  
Research Centre ◽  
14C Dating ◽  
Ams 14C Dating

scholarly journals AMS 14C Dating at the Scottish Universities Environmental Research Centre (SUERC) Radiocarbon Dating Laboratory

Radiocarbon ◽  
2016 ◽  
Vol 58 (1) ◽  
pp. 9-23 ◽  
Author(s):  
E Dunbar ◽  
G T Cook ◽  
P Naysmith ◽  
B G Tripney ◽  
S Xu
Keyword(s):  
Radiocarbon Dating ◽  
Tooth Enamel ◽  
Sample Selection ◽  
Sample Pretreatment ◽  
Bone Collagen ◽  
Environmental Research ◽  
Research Centre ◽  
14C Dating ◽  
Commercial Activities ◽  
Main Emphasis

AbstractThis paper describes all the major procedures adopted by the Scottish Universities Environmental Research Centre (SUERC) Radiocarbon Dating Laboratory. This includes sample pretreatment, graphite production, accelerator mass spectrometry (AMS) measurement, associated stable isotope measurements, data handling, and age calculations, but with the main emphasis being on the chemical pretreatment methods. All of the above enable the laboratory to provide a complete analytical service comprising advice on sample selection, preparation and analysis of samples, and Bayesian analysis of resulting 14C (and other) data. This applies to both our research and commercial activities. The pretreatment methods that we mainly focus on are used to remove contaminant carbon from a range of sample types or to isolate a particular chemical fraction from a sample prior to combustion/hydrolysis, graphitization, and subsequent AMS 14C measurement. The methods described are for bone (collagen extraction, with and without ultrafiltration), cremated bone, tooth enamel, charcoal, grain, carbon residues, shell, wood (including alpha-cellulose isolation), peat, sediments, textiles, fuel/biofuel, and forensic samples.

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.

scholarly journals Capabilities of the New SUERC 5MV AMS Facility for 14C Dating

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 59-64 ◽  
Author(s):  
S Xu ◽  
R Anderson ◽  
C Bryant ◽  
G T Cook ◽  
A Dougans ◽  
...  
Keyword(s):  
Ion Source ◽  
Negative Ion ◽  
Environmental Research ◽  
Research Centre ◽  
Performance Tests ◽  
14C Dating ◽  
Routine Measurement ◽  
Consensus Values ◽  
Accelerator Mass Spectrometer ◽  
Routine Basis

A new National Electrostatic Corporation (NEC) 5MV accelerator mass spectrometer became operational at the Scottish Universities Environmental Research Centre (SUERC) in July 2002. It has 2 Cs sputter negative ion sources: a 134-sample source (S1) for the routine measurement of all species, and a hybrid source (S2) with 40 spaces for radiocarbon measurements with either graphite or CO2 samples. A number of performance tests on graphite samples have been carried out on both sources. A precison of better than 0.3% is feasible for modern samples on a routine basis. The 14C background of the machine and the graphite preparation process blank are 0.04 ± 0.01 and 0.16 ± 0.05 pMC, respectively, indicating that 14C dating back to ~50 kyr BP is possible. The normalized 14C values for a series of reference materials agree well with the IAEA, TIRI, and FIRI consensus values. Routine measurement of 14C has been underway since May 2003. Preliminary results of performance tests on the CO2 gas ion source are also reported.

scholarly journals AMS 14C Dating of the Cremated Human Bones and Funeral Fuel of the Western Balts. In Theory and in Practice

2019 ◽  
Vol 20 ◽  
pp. 40-74
Author(s):  
Roman Shiroukhov
Keyword(s):  
Static Analysis ◽  
Radiocarbon Dating ◽  
Baltic Region ◽  
14C Dating ◽  
Human Bones ◽  
Dating Method ◽  
Ams 14C Dating

The article is dedicated to the application of AMS 14C dating method of cremated bones and samples of related charcoal, which is rather new for the East Baltic region. The data of 3 Western Balts cemeteries from Lithuania are analysed. Results of radiocarbon dating are compared to the estimated typological chronology of the artefacts. The OxCal simulation is applied in order to obtain the most probable dates. The study lays the foundation for further spatial and static analysis of selected data.

scholarly journals Successful AMS 14C Dating of Non-Hydraulic Lime Mortars from the Medieval Churches of the Åland Islands, Finland

Radiocarbon ◽  
2010 ◽  
Vol 52 (1) ◽  
pp. 171-204 ◽  
Author(s):  
Jan Heinemeier ◽  
Åsa Ringbom ◽  
Alf Lindroos ◽  
Árný E Sveinbjörnsdóttir
Keyword(s):  
Direct Contact ◽  
Radiocarbon Dating ◽  
14C Dating ◽  
Hydraulic Lime ◽  
Ams Radiocarbon Dating ◽  
Lime Mortars ◽  
Ams Dating ◽  
Chemical Testing ◽  
Shed Light ◽  
Ams 14C Dating

Fifteen years of research on accelerator mass spectrometry (AMS) radiocarbon dating of non-hydraulic mortar has now led to the establishment of a chronology for the medieval stone churches of the Åland Islands (Finland), where no contemporary written records could shed light on the first building phases. In contrast to other material for dating, well-preserved mortar is abundantly available from every building stage.We have gathered experience from AMS dating of 150 Åland mortar samples. Approximately half of them have age control from dendrochronology or from 14C analysis of wooden fragments in direct contact with the mortar. Of the samples with age control, 95% of the results agree with the age of the wood. The age control from dendrochronology, petrologic microscopy, chemical testing of the mortars, and mathematical modeling of their behavior during dissolution in acid have helped us to define criteria of reliability to interpret the 14C results when mortar dating is the only possibility to constrain the buildings in time. With these criteria, 80% of all samples reached conclusive results, and we have thus far been able to establish the chronology of 12 out of the 14 churches and chapels, while 2 still require complementary analyses.

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 High-Resolution AMS 14C Dating of Post-Bomb Peat Archives of Atmospheric Pollutants

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 495-515 ◽  
Author(s):  
Michael E Goodsite ◽  
Werner Rom ◽  
Jan Heinemeier ◽  
Todd Lange ◽  
Suat Ooi ◽  
...  
Keyword(s):  
High Resolution ◽  
Radiocarbon Dating ◽  
General Purpose ◽  
Atmospheric Pollutants ◽  
Published Data ◽  
14C Dating ◽  
Peat Deposits ◽  
Dating Method ◽  
Ams 14C Dating ◽  
Made In

Peat deposits in Greenland and Denmark were investigated to show that high-resolution dating of these archives of atmospheric deposition can be provided for the last 50 years by radiocarbon dating using the atmospheric bomb pulse. 14C was determined in macrofossils from sequential one cm slices using accelerator mass spectrometry (AMS). Values were calibrated with a general-purpose curve derived from annually averaged atmospheric 14CO2 values in the northernmost northern hemisphere (NNH, 30°–90°N). We present a thorough review of 14C bomb-pulse data from the NNH including our own measurements made in tree rings and seeds from Arizona as well as other previously published data. We show that our general-purpose calibration curve is valid for the whole NNH producing accurate dates within 1–2 years. In consequence, 14C AMS can precisely date individual points in recent peat deposits within the range of the bomb-pulse (from the mid-1950s on). Comparing the 14C AMS results with the customary dating method for recent peat profiles by 210Pb, we show that the use of 137Cs to validate and correct 210Pb dates proves to be more problematic than previously supposed.As a unique example of our technique, we show how this chronometer can be applied to identify temporal changes in Hg concentrations from Danish and Greenland peat cores.

scholarly journals AMS 14C Dating of Romanesque Rotunda and Stone Buildings of a Medieval Monastery in Łekno, Poland

Radiocarbon ◽  
2009 ◽  
Vol 51 (2) ◽  
pp. 471-480 ◽  
Author(s):  
Andrzej M Wyrwa ◽  
Tomasz Goslar ◽  
Justyna Czernik
Keyword(s):  
Radiocarbon Dating ◽  
Firing Process ◽  
Historical Sources ◽  
14C Dating ◽  
Central Poland ◽  
Phases Of Development ◽  
The Church ◽  
Archaeological Excavations ◽  
Ams 14C Dating ◽  
Better Than

Archaeological excavations performed for many years in Łekno, central Poland, have exposed relicts of wooden fortified settlements, and in its enclosure also basements of stone buildings, consisting of Romanesque rotunda and a Cistercian monastery, including an oratory, church, and abbot's house. Earlier archaeological, structural, and stratigraphical studies have shown that these buildings were constructed in a sequence and represented several phases of development.In this paper, we present results of radiocarbon dating of stone buildings of the rotunda and the monastery. For 14C dating, we used tiny pieces of charcoal retrieved from calcareous and gypsum mortar binding stone elements from the buildings. These pieces were incorporated in mortar during the firing process, where the fuel used for firing was wood. Most of the obtained 14C dates formed clear groups, confirming that individual buildings were constructed in separate periods. Calibrated 14C dates of these phases agree well with the constraints provided by historical sources, and enable us to set their ages with accuracy better than previously available. In particular, we have learned that the oldest rotunda was built at the boundary of the 10/11th centuries, and the church and the abbot's house, before AD 1250. However, some samples gave much too old 14C ages, clearly reflecting the use of old wood for firing. These problems were revealed only for samples from the rotunda and for the gypsum stone ornamental details.

scholarly journals Investigation of a cold-based ice apron on a high-mountain permafrost rock wall using ice texture analysis and micro-14C dating: a case study of the Triangle du Tacul ice apron (Mont Blanc massif, France)

2021 ◽  
pp. 1-8
Author(s):  
Grégoire Guillet ◽  
Susanne Preunkert ◽  
Ludovic Ravanel ◽  
Maurine Montagnat ◽  
Ronny Friedrich
Keyword(s):  
Radiocarbon Dating ◽  
Boundary Migration ◽  
Ice Core ◽  
Ice Cores ◽  
Shear Plane ◽  
High Mountain ◽  
14C Dating ◽  
Rock Wall ◽  
Major Mechanism ◽  
Mont Blanc Massif

Abstract The current paper studies the dynamics and age of the Triangle du Tacul (TDT) ice apron, a massive ice volume lying on a steep high-mountain rock wall in the French side of the Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long ice cores were drilled to bedrock (i.e. the rock wall) in 2018 and 2019 at the TDT ice apron. Texture (microstructure and lattice-preferred orientation, LPO) analyses were performed on one core. The two remaining cores were used for radiocarbon dating of the particulate organic carbon fraction (three samples in total). Microstructure and LPO do not substantially vary with along the axis of the ice core. Throughout the core, irregularly shaped grains, associated with strain-induced grain boundary migration and strong single maximum LPO, were observed. Measurements indicate that at the TDT ice deforms under a low strain-rate simple shear regime, with a shear plane parallel to the surface slope of the ice apron. Dynamic recrystallization stands out as the major mechanism for grain growth. Micro-radiocarbon dating indicates that the TDT ice becomes older with depth perpendicular to the ice surface. We observed ice ages older than 600 year BP and at the base of the lowest 30 cm older than 3000 years.

scholarly journals Six centuries of adaptation to a challenging island environment: AMS 14C dating and stable isotopic analysis of pre-Columbian human remains from the Bahamian archipelago reveal dietary trends

2021 ◽  
Vol 254 ◽  
pp. 106780
Author(s):  
Rick J. Schulting ◽  
Christophe Snoeck ◽  
John Pouncett ◽  
Fiona Brock ◽  
Christopher Bronk Ramsey ◽  
...  
Keyword(s):  
Human Remains ◽  
Isotopic Analysis ◽  
14C Dating ◽  
Stable Isotopic Analysis ◽  
Stable Isotopic ◽  
Bahamian Archipelago ◽  
Ams 14C Dating
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