Levels and transfer of 210Po and 210Pb in Nordic terrestrial ecosystems

Recent developments regarding environmental impact assessment methodologies for radioactivity have precipitated the need for information on levels of naturally occurring radionuclides within and transfer to wild flora and fauna. The objectives of this study were therefore to determine activity conce...

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Bibliographic Details
Published in:Journal of environmental radioactivity 2011-05, Vol.102 (5), p.430-437
Main Authors: Brown, J.E., Gjelsvik, R., Roos, P., Kålås, J.A., Outola, I., Holm, E.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Animals
Applied ecology
Biokinetic
Biological and medical sciences
Ecosystem
Ecotoxicology, biological effects of pollution
Finland
Fundamental and applied biological sciences. Psychology
Invertebrates
Lead Radioisotopes - analysis
Lead Radioisotopes - chemistry
Lead Radioisotopes - pharmacokinetics
Norway
Pb-210
Po-210
Polonium - analysis
Polonium - chemistry
Polonium - pharmacokinetics
Radiation Monitoring
Risk Assessment
Terrestrial ecosystem
Terrestrial environment, soil, air
Transfer
Vertebrates
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Summary:Recent developments regarding environmental impact assessment methodologies for radioactivity have precipitated the need for information on levels of naturally occurring radionuclides within and transfer to wild flora and fauna. The objectives of this study were therefore to determine activity concentrations of the main dose forming radionuclides 210Po and 210Pb in biota from terrestrial ecosystems thus providing insight into the behaviour of these radioisotopes. Samples of soil, plants and animals were collected at Dovrefjell, Central Norway and Olkiluoto, Finland. Soil profiles from Dovrefjell exhibited an approximately exponential fall in 210Pb activity concentrations from elevated levels in humus/surface soils to “supported” levels at depth. Activity concentrations of 210Po in fauna (invertebrates, mammals, birds) ranged between 2 and 123 Bq kg −1 d.w. and in plants and lichens between 20 and 138 Bq kg −1 d.w. The results showed that soil humus is an important reservoir for 210Po and 210Pb and that fauna in close contact with this media may also exhibit elevated levels of 210Po. Concentration ratios appear to have limited applicability with regards to prediction of activity concentrations of 210Po in invertebrates and vertebrates. Biokinetic models may provide a tool to explore in a more mechanistic way the behaviour of 210Po in this system.
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2010.06.016