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Fit-for-purpose modelling of radiocaesium soil-to-plant transfer for nuclear emergencies: a review

Almahayni, Talal; Beresford, Nicholas A.; Crout, Neil M.J.; Sweeck, Lieve

Fit-for-purpose modelling of radiocaesium soil-to-plant transfer for nuclear emergencies: a review Thumbnail


Authors

Talal Almahayni

Nicholas A. Beresford

Neil M.J. Crout

Lieve Sweeck



Abstract

Numerous radioecological models have been developed to predict radionuclides transfer from contaminated soils to the food chain, which is an essential step in preparing and responding to nuclear emergencies. However, the lessons learned from applying these models to predict radiocaesium (RCs) soil-to-plant transfer following the Fukushima accident in 2011 renewed interest in RCs transfer modelling. To help guide and prioritise further research in relation to modelling RCs transfer in terrestrial environments, we reviewed existing models focussing on transfer to food crops and animal fodders.
To facilitate the review process, we categorised existing RCs soil-to-plant transfer models into empirical, semi-mechanistic and mechanistic, though several models cross the boundaries between these categories. The empirical approach predicts RCs transfer to plants based on total RCs concentration in soil and an empirical transfer factor. The semi-mechanistic approach takes into account the influence of soil characteristics such as clay and exchangeable potassium content on RCs transfer. It also uses ?bioavailable? rather than total RCs in soil. The mechanistic approach considers the physical and chemical processes that control RCs distribution and uptake in soil-plant systems including transport in the root zone and root absorption kinetics.
Each of these modelling approaches has its advantages and disadvantages. The empirical approach is simple and requires two inputs, but it is often associated with considerably uncertainty due to the large variability in the transfer factor. The semi-mechanistic approach factorises more soil and plant parameters than the empirical approach; therefore, it is applicable to a wider range of environmental conditions. The mechanistic approach is instrumental in understanding RCs mobility and transfer in soil-plant systems; it also helps to identify influential soil and plant parameters. However, the comlexity and the large amount of specific parameters make this approach impractical for nuclear emergency preparedness and response purposes.
We propose that the semi-mechanistic approach is sufficiently robust and practical, hence more fit for the purpose of planning and responding to nuclear emergencies compared with the empirical and mechanistic approaches. We recommend further work to extend the applicability of the semi-mechanistic approach to a wide range of plants and soils.

Journal Article Type Article
Acceptance Date Jan 22, 2019
Online Publication Date Feb 15, 2019
Publication Date May 1, 2019
Deposit Date Apr 9, 2019
Publicly Available Date Apr 9, 2019
Journal Journal of Environmental Radioactivity
Print ISSN 0265-931X
Electronic ISSN 1879-1700
Publisher Elsevier
Peer Reviewed Not Peer Reviewed
Volume 201
Pages 58-66
DOI https://doi.org/10.1016/j.jenvrad.2019.01.006
Keywords Waste Management and Disposal; Pollution; Health, Toxicology and Mutagenesis; Environmental Chemistry; General Medicine
Public URL https://nottingham-repository.worktribe.com/output/1769226
Publisher URL https://www.sciencedirect.com/science/article/pii/S0265931X18308610

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