Temporal trend in the transfer of Sellafield-derived 14C into different size fractions of the carbonate component of NE Irish Sea sediment

Muir, G. K. P. , Cook, G. T. , Tripney, B. G. , MacKenzie, A. B., Stewart, H. and Tierney, K. M. (2015) Temporal trend in the transfer of Sellafield-derived 14C into different size fractions of the carbonate component of NE Irish Sea sediment. Radiocarbon, 57(3), pp. 347-354. (doi: 10.2458/azu_rc.57.18399)

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From 1994 onwards, 14C discharges from the Sellafield nuclear fuel reprocessing plant have been made largely to the Northeast Irish Sea. They represent the largest contributor to UK and European populations of the collective dose commitment derived from the entire nuclear industry discharges. Consequently, it is important to understand the long-term fate of 14C in the marine environment. Research undertaken in 2000 suggested that the carbonate component of Northeast Irish Sea sediments would increase in 14C activity as mollusc shells, which have become enriched in Sellafield-derived 14C, are broken down by physical processes including wave action and incorporated into intertidal and sub-tidal sediments. The current study, undertaken in 2011, tested this hypothesis. The results demonstrate significant increases in 14C enrichments found in whole mussel shells compared to those measured in 2000. Additionally, in 2000, there was an enrichment above ambient background within only the largest size fraction (>500 μm) of the intertidal inorganic sediment at Nethertown and Flimby (north of Sellafield). In comparison, the present study has demonstrated 14C enrichments above ambient background in most size fractions at sites up to 40 km north of Sellafield, confirming the hypothesis set out more than a decade ago.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Tripney, Dr Brian and Cook, Professor Gordon and MacKenzie, Professor Angus and Tierney, Mr Kieran and Muir, Dr Graham
Authors: Muir, G. K. P., Cook, G. T., Tripney, B. G., MacKenzie, A. B., Stewart, H., and Tierney, K. M.
Subjects:Q Science > QD Chemistry
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Radiocarbon
Publisher:University of Arizona
ISSN (Online):0033-8222
Copyright Holders:Copyright © 2015 The Arizona Board of Regents on behalf of the University of Arizona
First Published:First published in Radiocarbon 57(3):347-354
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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