Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-459 - C1-464|
|Published online||14 October 2009|
The effect of chemical speciation on the impact of 129I discharges to atmosphere from BNFL Sellafield, Cumbria
Westlakes Research Institute, International Research and Graduate Centre, Westlakes Science & Technology Park, Moor Row, Cumbria CA24 3JY, U.K.
2 T.H. Huxley School of Environment, Earth Sciences and Engineering, Imperial College of Science, Technology and Medicine, Silwood Park, Berkshire SL5 7TE, U.K.
129I is produced through neutron-induced fission of 235U and neutron capture reactions with the fission products 128Te and 130Te in the cores of nuclear reactors. This typically constitutes about 1 % of the total fission products, depending on fuel burn-up. Whilst 129I is not released in routine discharges from nuclear power plants it is released during reprocessing. The ability to model 129I behaviour (important for prospective assessments) has been relatively poor. This is due both to variability in the reported behaviour of iodine, which may be related to abundance and physico-chemical form, and to the relative paucity of data for 129I. The primary aims of this study are to measure environmental concentrations of 129l around Sellafield; to establish whether the chemical species of iodine in air differs as a function of the source term, and; to determine concomitant values for model parameters defining 129I transport through the environment. Some differences in the environmental transport of 129I are observed, albeit slight, apparently related to source term. These findings suggest that a source-specific approach may be appropriate. The critical group dose arising from 129l is estimated to be about 1.4 µSv a-1 to adults and 3.2 µSv a-1 to infants.
© EDP Sciences, 2002
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