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Evaluation of uncertainties in environmental impact assessment of naturally occurring radiation exposure situations on example of undisturbed and legacy NORM sites in the Fen Complex, Norway

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Abstract

The risk from naturally occurring radioactive materials (NORM) has been extensively assessed, and this has led to the integration of specific NORM radiation protection requirements within the latest EU Directive 2013/59. Nevertheless, it has been internationally recognised that remaining NORM knowledge gaps and uncertainties now present similarly significant issues in addressing recent regulatory requirements. The multi-tiered nature of environmental impact assessment (EIA) implies per se possibility for uncertainties, but when EIA at radiation exposure sites includes consideration of sites with multiple radiation and contamination sources, different ecosystem transport pathways, effects and risks by applying different parameters and models, level of overall uncertainty increases. The results of EIA study in the Fen area in Norway, comprised of undisturbed and legacy NORM sites, have been evaluated in this analysis, in order to identify all existing input uncertainties and how they may impact the final conclusions, and thus, influence any subsequent decision-making. The main uncertainties have been identified in the measurement and exposure analysis tier, and were related to the heterogeneous distribution of radionuclides, radionuclide speciation, as well as to generic variability issues in the concepts used for mobility and biota uptake analysis (such as distribution coefficient, transfer factors and concentration ratios) as well as radioecological modelling. The uncertainties in the input values to the calculation of the dose arising from radon exposure in the Fen area led to an overall elevated uncertainty of the magnitude of the radiation exposure dose of humans. It has been concluded that an integrated, ecosystem-based approach with consideration of complexity of prevailing environmental conditions and interconnections must be applied to fully understand possible radiation effects and risks.

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Acknowledgements

The authors would like to thank Dr. Simon Mark Jerome (Centre for Environmental Radioactivity (CERAD), Norwegian University of Life Sciences (NMBU), Norway) whose valuable corrections and suggestions improved this paper significantly.

Funding

This project was supported by the Research Council of Norway through its Centre of Excellence funding scheme, project number 223268/F50.

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  1. Norwegian Radiation and Nuclear Safety Authority (DSA), Østerås, Norway

    Jelena Mrdakovic Popic

  2. Centre for Environmental Radioactivity (CERAD), Norwegian University of Life Sciences (NMBU), Ås, Norway

    Lindis Skipperud

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Correspondence to Jelena Mrdakovic Popic.

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Popic, J.M., Skipperud, L. Evaluation of uncertainties in environmental impact assessment of naturally occurring radiation exposure situations on example of undisturbed and legacy NORM sites in the Fen Complex, Norway. Environ Monit Assess 192, 782 (2020). https://doi.org/10.1007/s10661-020-08747-8

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