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Using a Silica Substrate to Monitor the Effectiveness of Radiocarbon Pretreatment

Published online by Cambridge University Press:  18 July 2016

M W Dee ,
F Brock ,
A D Bowles  and
C Bronk Ramsey
M W Dee*
Affiliation:
Oxford Radiocarbon Accelerator Unit (ORAU), Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom.
F Brock
Affiliation:
Oxford Radiocarbon Accelerator Unit (ORAU), Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom.
A D Bowles
Affiliation:
Oxford Radiocarbon Accelerator Unit (ORAU), Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom.
C Bronk Ramsey
Affiliation:
Oxford Radiocarbon Accelerator Unit (ORAU), Research Laboratory for Archaeology and the History of Art (RLAHA), University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, United Kingdom.
*
Corresponding author. Email: [email protected].
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Abstract

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The objective of radiocarbon pretreatment is to eliminate any contaminant carbon from the sample material. Solvent washes and acid-base-acid (ABA) procedures are widely used for this purpose. However, quantitatively analyzing their effectiveness is surprisingly problematic, as it often requires large numbers of 14C measurements or high-precision compositional analysis. The technique presented here involves monitoring the impact of different forms of contamination by measuring their adherence to a non-carbonaceous substrate called Chromosorb®. Firstly, the substrate was used in place of a 14C sample in order to monitor the accrual of carbon contamination during a standard solvent wash and ABA pretreatment. This produced a contamination profile against which modifications to the pretreatment procedure could be compared. Secondly, stocks were prepared of Chromosorb that had been infused with environmental contaminants and with common glues, adhesives, and preservatives. By monitoring the elimination of carbon from these stocks, the effectiveness of different pretreatment procedures could be evaluated and the most problematic of the contaminants for 14C dating could be identified.

Type
Articles
Information
Radiocarbon , Volume 53 , Issue 4 , 2011 , pp. 705 - 711
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

References

Brock, F, Higham, TFG, Ditchfield, P, Bronk Ramsey, C. 2010. Current pretreatment methods for AMs radiocarbon dating at the Oxford Radiocarbon Accelerator Unit (ORAU). Radiocarbon 52(1):103–12.CrossRefGoogle Scholar
Bruhn, F, Duhr, A, Grootes, PM, Mintrop, A, Nadeau, M-J 2001. Chemical removal of conservation substances by ‘Soxhlet’-type extraction. Radiocarbon 43(2A):229–37.CrossRefGoogle Scholar
D'Elia, M, Gianfrate, G, Quarta, G, Giotta, L, Giancane, G, Calcagnile, L. 2007. Evaluation of possible contamination sources in the 14C analysis of bone samples by FTIR spectroscopy. Radiocarbon 49(2):201–10.CrossRefGoogle Scholar
de Vries, H, Barendsen, GW. 1954. Measurements of age by the Carbon-14 technique. Nature 174(4442):1138–41.CrossRefGoogle Scholar
Goslar, T, Pazdur, MF. 1985. Contamination studies on mollusk shell samples. Radiocarbon 27(1):33–42.CrossRefGoogle Scholar
Gowlett, JAJ. 1987. The archaeology of radiocarbon accelerator dating. Journal of World Prehistory 1(2):127–70.Google Scholar
Green, JW. 1963. Wood Cellulose. New York: Academic Press.Google Scholar
Green, LR, Thickett, D. 1995. Testing materials for use in the storage and display of antiquities: a revised methodology. Studies in Conservation 40(3):145–52.Google Scholar
Hoper, ST, McCormac, FG, Hogg, AG, Higham, TFG, Head, MJ. 1998. Evaluation of wood pretreatments on oak and cedar. Radiocarbon 40(1):45–50.CrossRefGoogle Scholar
van Klinken, GJ, Hedges, REM. 1998. Chemistry strategies for organic 14C samples. Radiocarbon 40(1):51–6.Google Scholar
Yates, T. 1986. Studies of non-marine mollusks for the selection of shell samples for radiocarbon dating. Radiocarbon 28(2A):457–63.CrossRefGoogle Scholar
Yizhaq, M, Mintz, G, Cohen, I, Khalaily, H, Weiner, S, Boaretto, E. 2005. Quality controlled radiocarbon dating of bones and charcoal from the Early Pre-Pottery Neolithic B (PPNB) of Motza (Israel). Radiocarbon 47(2):193–206.CrossRefGoogle Scholar