Volume 44, Number 5, 2009ECORAD 2008 - Radioecology and Environmental Radioactivity
|Page(s)||595 - 600|
|Published online||06 June 2009|
Characterisation of background dose-rates for marine environments
Norwegian Radiation Protection Authority, PO Box 55, 1332 Østerås, Norway
Environmental risk assessment methodologies often require background dose-rates for wild flora and fauna to be derived in a robust and transparent way. To facilitate this task, information can be organised around reference organisms (ROs), entities that can be used as representatives of the broader ecosystem. In this study, generic datasets have been collated on levels of naturally occurring radionuclides in sediments, seawater and ROs for marine ecosystems. In some cases, data gap filling methods have been required owing to a paucity of information. Once full datasets have been acquired, dose conversion coefficients (DCCs) can be applied and dose-rate calculations can be performed probabilistically allowing the variability in the underlying datasets to be accounted for. Unweighted absorbed dose-rates for marine reference organisms lie between 0.02–1.2 µGy h-1, whereas weighted dose-rates fall in the range 0.08 µGy h-1 to 8.8 µGy h-1. Except for the special case of sea anemones/corals, the most important nuclides for the total dose-rates are 210Po and 226Ra for heterotrophic ROs (i.e. all vertebrate and invertebrate animals), whereas 226Ra and 228Th contribute most for autotrophic ROs (i.e. macroalgae, phytoplankton and aquatic plants). In addition, 40K has a considerable impact on unweighted dose-rates for all ROs. Non-parametric statistical tests have been applied to show whether there are differences between activity concentrations data for ROs and ICRP-defined Reference Animals and Plants (RAPs).
© EDP Sciences, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.