Numéro Radioprotection Volume 44, Numéro 5, 2009 ECORAD 2008 - Radioecology and Environmental Radioactivity Page(s) 47 - 52 DOI 10.1051/radiopro/20095015 Publié en ligne 06 Juin 2009

Radioprotection 2009, Vol. 44, n° 5, pages 47 à 52
DOI: 10.1051/radiopro/20095015

Derivation of allometric relationships for radionuclides in marine phyla

J. Vives i Batlle¹, R.C. Wilson¹, S.J. Watts¹, P. McDonald¹ and A. Craze<sup>2

1</sup>  Westlakes Scientific Consulting Ltd., The Princess Royal Building, Westlakes Science and Technology Park, Moor Row, CA24 3LN Cumbria, UK
²  Nuclear Decommissioning Authority, Herdus House, Westlakes Science and Technology Park, Moor Row, CA24 3HU Cumbria, UK

jordi.vives@westlakes.ac.uk

Published online: 6 June 2009

Abstract
An allometric scaling approach has been used to calculate biological half-lives of elimination (T_B1/2) and concentration factors (CF) for radionuclides in marine biota. Power functions of organism mass are fitted to a biokinetic database for plankton, seaweed, fish, crustaceans and molluscs, using data generated by us, in combination with reviewed data. Scaling of the CF to M^{-0.26 ± 0.09} is observed, compatible at ±1σ with metabolic theory predictions that metabolism scales to M^0.75. We also observe scaling of T_B1/2 to M^{+0.16 ± 0.03}, within the previously reported range +0.15 to +0.30 for biota from various environments and, at < ± 3σ, slightly outside turnover rate scaling predictions to M^-0.25. The elements for which the CF scales better allometrically are particle seeking, mainly lanthanides and actinides. Association of the independent term of the allometric power function a with the sediment-water partition coefficient K_d is strongest for these elements, possibly through binding to biological/organic matter. The findings from this study are relevant to extend the range of applicability of our biota dose assessment methodologies where data gaps in transfer exist.

© EDP Sciences 2009

Comment afficher un lien OpenURL ?