An Assessment of Aquatic Radiation Pathways in Northern Ireland
This report describes an assessment of aquatic radiation exposure pathways in Northern Ireland, It comprises:
The aim of the habits survey was to obtain site specific habits survey data for use in identifying radiation exposure pathways to the local population and subsequent definition of critical groups. Rates for seafood consumption, occupancy of coastal areas, and handling of commercial fishing gear, seaweed, shellfish and sediment were obtained. Consideration was also given to potential radiation exposure through related terrestrial pathways, e.g. use of seaweed as a fertiliser on land used for food production, and unusual and novel exposure pathways, such as seaweed and wildfowl consumption, beach sand use and inadvertent ingestion of seawater and sediment.
The habits of more than 800 individuals were recorded. The data mainly related to adults though some observations for children are presented.
The adult critical groups of local seafood consumers were identified as eating:
The species consumed were, rounded to the nearest 5%:
For coastal area occupancy, the survey identified the following adult critical groups:
For handling, the survey identified the following adult critical groups:
The following suggested additions or changes to the current monitoring programme are based on the findings of this survey.
All other sampling and in-situ measurements should remain unchanged.
For dose assessment purposes, it is considered that a conservative assessment of effective dose would be based on consumption of 99 kg/y fish, 34 kg/y crustaceans and 7.7 kg/y molluscs together with 1100 h/y occupancy over sand/mud.
The dose assessment combined the results of the habits survey with environmental monitoring data for 2000. It was found that the critical group in Northern Ireland would have received a dose of 0.018 mSv y-1, with 0.015 mSv y-1 due to consumption of seafood. Average rate seafood consumers would have received 0.003 mSv y-1. These doses are well within the recommended limit for members of the public of 1 mSv y-1.
Copies of this reports are available from the Foundation, price £25.00, less 20% to FWR members.
N.B. The report is available for download from the SNIFFER Website