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Investigation of the Analytical F14C Bone Background Value at SUERC

Published online by Cambridge University Press:  11 August 2017

E Dunbar ,
P Naysmith ,
G T Cook ,
E M Scott ,
S Xu  and
B G Tripney
E Dunbar*
Affiliation:
Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland, United Kingdom
P Naysmith
Affiliation:
Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland, United Kingdom
G T Cook
Affiliation:
Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland, United Kingdom
E M Scott
Affiliation:
School of Mathematics and Statistics, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
S Xu
Affiliation:
Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland, United Kingdom
B G Tripney
Affiliation:
Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF, Scotland, United Kingdom
*
*Corresponding author. Email: elaine.dunbar@glasgow.ac.uk.
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Abstract

The SUERC Radiocarbon Laboratory employs a one-step “background subtraction” method when calculating 14C ages. An interglacial wood (VIRI Sample K) is employed as the non-bone organic background standard, while a mammoth bone (LQH12) from Latton Quarry is used as the bone background standard. Results over several years demonstrate that the bone background is consistently around a factor of two higher and more variable than the wood background. As a result, the uncertainty on routine bone measurements is higher than for other sample types. This study investigates the factors that may contribute to the difference in F14C values and the higher variability. Preparations of collagen using modified Longin or ultrafiltration methods show no significant difference, nor does eliminating the collagen dissolution step. Two bone samples of known infinite age with respect to radiocarbon are compared and again no significant difference is observed. Finally, the quantity and age of the organic matter in the water used during the pretreatment is investigated and it is shown that there is insufficient organic matter in the reverse osmosis water to influence background values significantly. The attention is now on determining if incomplete demineralization could lead to contaminants being retained by the phosphate in the hydroxyapatite.

Keywords

background subtractionHeidelberg woodmammoth bonequality assuranceultrafiltration
Type
Method Development
Information
Radiocarbon , Volume 59 , Special Issue 5: 8th International Symposium, Edinburgh, 27 June – 1 July, 2016 Part 1 of 2 , October 2017 , pp. 1463 - 1473
Copyright
© 2017 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 8th Radiocarbon & Archaeology Symposium, Edinburgh, UK, 27 June–1 July 2016

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