Výsledky vyhledávání - "D. D. Harkness"

Precision and accuracy in applied C-14 dating

Autor: Israel Carmi, M Van Strydonck, Charlotte Bryant, Gordon Cook, E McGee, E. M. Scott, Steinar Gulliksen, G. Possnert, H van der Plicht, D D Harkness, Jan Heinemeier, Philip Naysmith

Publikováno v: Journal of Archaeological Science, 31(9), 1209-1213. ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD

Users in the Quaternary and Archaeological Sciences have expressed a general desire for significant improvements in the accuracy and precision of radiocarbon dating results in general but also allied to the measurement of small samples. The accuracy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::780e29f1fb8236fccc6e7a2318263df7
https://research.rug.nl/en/publications/13fa184c-71ef-41e0-82e1-6627954311da

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A new environmental sciences AMS laboratory in Scotland

Autor: Sarah E. Metcalfe, Anthony E. Fallick, Roger Scott, Stewart P.H.T. Freeman, Paul Bishop, Michael A. Summerfield, Gordon Cook, Marian Scott, D D Harkness, Charlotte Bryant

Publikováno v: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. :31-34

A new Scottish AMS laboratory complements existing local facilities for radiocarbon and other cosmogenic isotope environmental research. A 5 MV Pelletron based accelerator mass spectrometer has been installed in a purpose-built building. The instrume

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1324ef0b6949bb96966aeb120ade9534
https://doi.org/10.1016/j.nimb.2004.04.010

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A coherent high-precision radiocarbon chronology for the Late-glacial sequence at Sluggan Bog, Co. Antrim, Northern Ireland

Autor: Siwan M. Davies, D. D. Harkness, E. M. Scott, J. John Lowe, Charlotte Bryant, Michael Walker

Publikováno v: Journal of Quaternary Science. 19:147-158

Seventy-five radiocarbon dates are presented from Sluggan Bog in Co. Antrim, Northern Ireland. The Holocene peats are underlain by Late-glacial sediments, which also appear to have accumulated largely in a mire environment. The radiocarbon dates, fro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6cc00dc1e50edb8e08e77d1494a860d6
https://doi.org/10.1002/jqs.814

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Devensian Lateglacial environmental changes in Britain: a multi-proxy environmental record from Llanilid, South Wales, UK

Autor: C. Sheldrick, Chris S. M. Turney, J. John Lowe, D. D. Harkness, Michael Walker, Simon Blockley, G. R. Coope

Publikováno v: Quaternary Science Reviews. 22:475-520

A multi-proxy environmental record for the Devensian (Weichselian) Lateglacial and early Holocene periods, which includes pollen, plant macrofossil, coleopteran, geochemical and stable-isotope data, is described from a site at Llanilid, South Wales,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1cf79a5a1cd92708c7ce9c67ed3c51df
https://doi.org/10.1016/s0277-3791(02)00247-0

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Towards a Radiocarbon Chronology of the Late-Glacial: Sample Selection Strategies

Autor: E. M. Scott, G. R. Coope, D D Harkness, Michael Walker, Charlotte Bryant, J. John Lowe

Publikováno v: Radiocarbon. 43:1007-1019

This paper outlines a dating program designed to test the reproducibility of radiocarbon dates on different materials of Late-Glacial age (plant macrofossils, fossil beetle remains, and the “humic” and “humin” chemical fractions of limnic sed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7a74c34b97f2ac696e3d7ce6d289e566
https://doi.org/10.1017/s0033822200041679

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Is Comparability of 14C Dates an Issue?: A Status Report on the Fourth International Radiocarbon Intercomparison

Autor: M Van Strydonck, E McGee, G. Possnert, D D Harkness, C. Bryant, Philip Naysmith, Steinar Gulliksen, Jan Heinemeier, Israel Carmi, E. M. Scott, Gordon Cook, van der Johannes Plicht

Publikováno v: Radiocarbon. 43:321-324

For more than 15 years, the radiocarbon community has participated in a series of laboratory intercomparisons in response to the issue of comparability of measurements as perceived within the wider user communities (Scott et al. 1990; Rozanski et al.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::457c312b8afd146e4c7765a07a55a7cd
https://doi.org/10.1017/s0033822200038170

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Sample requirements and design of an inter-laboratory trial for radiocarbon laboratories

Autor: van der Johannes Plicht, Steinar Gulliksen, E McGee, Philip Naysmith, Jan Heinemeier, D D Harkness, Carmi, Charlotte Bryant, Gordon Cook, G. Possnert, M Van Strydonck, Israel Carmi

Publikováno v: Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, 172(1), 355-358. ELSEVIER SCIENCE BV

An on-going inter-comparison programme which is focused on assessing and establishing consensus protocols to be applied in the identification, selection and sub-sampling of materials for subsequent C-14 analysis is described. The outcome of the progr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74f40d6ad71d408b4a0603b822d4af6d
https://doi.org/10.1016/s0168-583x(00)00098-7

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Drought and dust deposition in the West African Sahel: a 5500-year record from Kajemarum Oasis, northeastern Nigeria

Autor: F. A. Street-Perrott, Jonathan A. Holmes, RA Perrott, M. J. Allen, D. D. Harkness, N Barber, M Ivanovich, P. A. Fothergill, Dirk Kroon, Martyn Waller

Publikováno v: The Holocene. 10:293-302

A high-resolution, multiproxy palaeolimnological record from the Manga Grasslands, northeastern Nigeria, spanning the last 5500 calendar years, reveals the episodic deterioration in Sahelian climate as significant biogeophysical thresholds were cross

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cf7d027b485badaefd4457bd69d67b7f
https://doi.org/10.1191/095968300678141274

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A Radiocarbon Database for Scottish Archaeological Samples

Autor: D D Harkness, Patrick Ashmore, Gordon Cook

Publikováno v: Radiocarbon. 42:41-48

For the majority of dating laboratories and their respective user communities, the journal Radiocarbon is no longer regarded as the medium for primary publication of radiocarbon measurements. In compliance with editorial policy, the emphasis has long

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8cdf7b9de19724b110fe4e01f59d6a0e
https://doi.org/10.1017/s0033822200053030

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What Future for Radiocarbon?

Autor: D D Harkness, E M Scott

Publikováno v: Radiocarbon. 42:173-178

In this short article, we summarize some milestones in the 50-yr-long development of natural 14C measurement. In the light of this appraisal we presume to hazard some personal opinions and forecasts as to where best opportunities might lie for future

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::608a4159b4d60d81f34d0350446c3312
https://doi.org/10.1017/s0033822200053121

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