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Modelling 99Tc concentrations in Fucus vesiculosus from the north-east Irish Sea by Claire Nawakowski; Michael D Nicholson; Peter John Kershaw; Kinson S Leonard is a Environmental Science article available to read on EtoBox.

What is Modelling 99Tc concentrations in Fucus vesiculosus from the north-east Irish Sea about?

In 1994 there were substantial increases in the quantity of 99 Tc discharged into the north-east Irish Sea from BNFL Sellafield (UK), concomitant with improvements in waste treatment procedures. As a consequence, the concentration of 99 Tc observed in seawater and biota samples, taken from the Irish Sea coastline, increased significantly. Elevated concentrations were also reported in Dutch, Danish, Norwegian, Swedish and Arctic waters in subsequent years. In the present study a simple numerical model was developed and applied to time-series data of 99 Tc concentrations in the brown seaweed Fucus vesiculosus, collected from three UK sites in the vicinity of Sellafield (St. Bees, Heysham, Port William). The model considered site-specific scaling effects, lag times, previous discharge history and potential seasonal variation in uptake. In general, there was a good fit between predicted and observed concentrations, but the degree of uncertainty varied inversely with the frequency of sampling. We did not observe a significant seasonal variation. The modelled lag times to the three sites were consistent with transport times based on observations of the water column distribution of 99 Tc.

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Author

Claire Nawakowski; Michael D Nicholson; Peter John Kershaw; Kinson S Leonard

Publisher

Elsevier Science; Elsevier ; Elsevier BV; Publons (ISSN 0265-931X)

Published

2004

Language

EN

Field

Environmental Science (Physical Sciences)