A5070204887- Archaeology and ancient environmental studies
- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Radioactive contamination and transfer
- Nuclear and radioactivity studies
- Pleistocene-Era Hominins and Archaeology
- Radioactivity and Radon Measurements
- Pacific and Southeast Asian Studies
- Graphite, nuclear technology, radiation studies
- Image Processing and 3D Reconstruction
- Ancient and Medieval Archaeology Studies
- Analytical Chemistry and Sensors
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Tree-ring climate responses
- Nuclear Physics and Applications
- Maritime and Coastal Archaeology
- Nuclear reactor physics and engineering
- Cultural Heritage Materials Analysis
- Arctic and Antarctic ice dynamics
- Eurasian Exchange Networks
- Paleopathology and ancient diseases
- Marine and coastal ecosystems
- Fire effects on ecosystems
- Electrochemical Analysis and Applications
University of Glasgow
2014-2024
Scottish Universities Environmental Research Centre
1989-2023
University of Arizona
1989-2020
Institut de l'Information Scientifique et Technique
2020
University of Nottingham
2019
Czech Academy of Sciences, Biology Centre
2019
Park University
2019
University of Lausanne
2019
DePaul University
2014
University of Alberta
2014
The IntCal09 and Marine09 radiocarbon calibration curves have been revised utilizing newly available updated data sets from 14 C measurements on tree rings, plant macrofossils, speleothems, corals, foraminifera. were derived the using random walk model (RWM) used to generate Marine09, which has account for additional uncertainties error structures. new ratified at 21st International Radiocarbon conference in July 2012 are as Supplemental Material www.radiocarbon.org. database can be accessed...
ABSTRACT Radiocarbon ( 14 C) ages cannot provide absolutely dated chronologies for archaeological or paleoenvironmental studies directly but must be converted to calendar age equivalents using a calibration curve compensating fluctuations in atmospheric C concentration. Although curves are constructed from independently archives, they invariably require revision as new data become available and our understanding of the Earth system improves. In this volume international both Northern...
Abstract Water temperature is critical for the ecology of lakes. However, ability to predict its spatial and seasonal variation constrained by lack a thermal classification system. Here we define lake regions using objective analysis surface dynamics from satellite observations. Nine are identified that mapped robustly largely contiguously globally, even small The differed other global patterns, so provide unique information. Using model forced 21 st century climate projections, found 12%,...
As a follow-up to the meeting of experts convened at International Atomic Energy Agency (IAEA) in February 1989, and 14 C Workshop held Glasgow September Quality Assurance Program was formulated. In joint effort several radiocarbon teams IAEA staff, we have prepared set five new intercomparison materials. These are natural materials frequently used by laboratories. The were distributed 137 laboratories May 1990. 1991, Vienna evaluate results, determine activity samples expressed % Modern...
High-quality data from appropriate archives are needed for the continuing improvement of radiocarbon calibration curves. We discuss here basic assumptions behind 14 C dating that necessitate and relative strengths weaknesses which obtained. also highlight procedures, problems, uncertainties involved in determining atmospheric surface ocean C/ 12 these archives, including a discussion various methods used to derive an independent absolute timescale uncertainty. The types required current...
For the older part of radiocarbon dating range, IntCal13 curve provides “state art” for terrestrial calibration based on all available data. It is constructed from different records, each which by themselves could be used as a “comparison tool,” depending research objectives. This paper discusses pros and cons approaches that can taken when using 14 C dates this time range where agreement amongst underlying data sets poorer than in other periods. The discussion illustrated with example...
ABSTRACT To create a reliable radiocarbon calibration curve, one needs not only high-quality data but also robust statistical methodology. The unique aspects of much the provide considerable modeling challenges and require made-to-measure approach to curve construction that accurately represents adapts these individualities, bringing together into single curve. For IntCal20, methodology has undergone complete redesign, from random walk used in IntCal04, IntCal09 IntCal13, an based upon...
In the initial aftermath of 1986 Chernobyl accident there were detrimental effects recorded on wildlife, including, mass mortality pine trees close to reactor, reduced seed production, reductions in soil invertebrate abundance and diversity likely death small mammals. More than 30 years after is no consensus longer-term impact chronic exposure radiation wildlife what now referred as Exclusion Zone. Reconciling this lack one main challenges for radioecology. With inclusion environmental...
This report describes a grossly and microscopically distinctive multicystic form of duct carcinoma the breast which we have termed cystic hypersecretory carcinoma. The outstanding morphologic feature is marked secretory activity with formation dilated ducts cysts containing homogeneous, eosinophilic material resembles thyroid colloid. inconspicuous epithelium lining gives rise to micropapillary also occurs in associated ducts. A biopsy that consists entirely elements, lacking papillary...
Proficiency testing is a widely used, international procedure common within the analytical chemistry community. A proficiency trial (which VIRI is) often follows standard protocol, including analysis that typically based on z -scores, with one key quantity, σ p . From laboratory intercomparison (sometimes called trial), we hope to gain an assessment of accuracy (in this case, from dendro-dated samples), precision (from any duplicate and generally, overall measure performance, measurement...
ABSTRACT The curves recommended for calibrating radiocarbon ( 14 C) dates into absolute have been updated. For atmospheric samples from the Northern Hemisphere, new curve is called IntCal20. This accompanied by associated SHCal20 Southern and Marine20 marine samples. In this “companion article” we discuss advances developments that led to improvements in updated highlight some issues of relevance general readership. particular dendrochronological based part has seen a significant increase...
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 routine measurement of all species, and hybrid (S2) with 40 spaces radiocarbon measurements either graphite or CO samples. number performance tests on samples have been carried out both sources. precison better than 0.3% is feasible modern...
River systems draining peaty catchments are considered a source of atmospheric CO2, thus understanding the behavior dissolved inorganic carbon pool (DIC) is valuable. The isotopic composition, δ13CDIC, and concentration, [DIC], fluvial samples collected diurnally, over 14 months, reveal DIC pools to be dynamic in range (−22 −4.9‰, 0.012 0.468 mmol L-1 C), responding predictably environmental influences such as changing hydrologic conditions or increased levels primary production. δ18O oxygen...
The Fifth International Radiocarbon Intercomparison (VIRI) continues the tradition of TIRI (third) and FIRI (fourth) (Scott 2003) intercomparisons operates in addition to any within-laboratory quality assurance measures as an independent check on laboratory procedures. VIRI is a phased intercomparison; results for first phase, which employed grain samples, were reported Scott et al. (2007). second involving bone here. third final includes samples peat, wood, shell, has also been completed...
In all facets of animal welfare, as in human health and quality life, the unambiguous valid measurement key attributes is critical importance. Welfare a complex construct this paper we present methodological framework for development composite welfare scale based on psychometric metrological principles creation developed medicine Psychology. We indicate how these can be applied resulting would then validated tested. Keywords: Animal WelfareComposite Measurement ScaleScaling...
Heavy metal ions (HMI), such as Cu <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$^{{2}+}$ </tex-math></inline-formula> , are harmful to the environment and our health. Such typically measured using glassy carbon electrode (GCE)-based electrochemical sensors developed on rigid substrates. However, several emerging applications require flexible, even disposable, Herein, we present a molybdenum disulfide...
The issue of comparability measurements (and thus bias, accuracy, and precision measurement) from diverse laboratories is one which has been the focus some attention both within radiocarbon community wider user communities. As a result, 14 C undertaken widescale, far-reaching, evolving program intercomparisons, to benefit users alike. is, however, indirect, since intercomparisons have not used generate “league tables” performance, but rather allow individual check procedures modify them as...