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Radioecological modelling of Polonium-210 and Caesium-137 in lichen-reindeer-man and top predators.

Artikel i vetenskaplig tidskrift
Författare Bertil R R Persson
Runhild Gjelsvik
Elis Holm
Publicerad i Journal of environmental radioactivity
Volym 186
Sidor 54-62
ISSN 1879-1700
Publiceringsår 2018
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för radiofysik
Sidor 54-62
Språk en
Länkar dx.doi.org/10.1016/j.jenvrad.2017.0...
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Radiofysik

Sammanfattning

This work deals with analysis and modelling of the radionuclides (210)Pb and(210)Po in the food-chain lichen-reindeer-man in addition to (210)Po and (137)Cs in top predators. By using the methods of Partial Least Square Regression (PLSR) the atmospheric deposition of (210)Pb and (210)Po is predicted at the sample locations. Dynamic modelling of the activity concentration with differential equations is fitted to the sample data. Reindeer lichen consumption, gastrointestinal absorption, organ distribution and elimination is derived from information in the literature. Dynamic modelling of transfer of (210)Pb and (210)Po to reindeer meat, liver and bone from lichen consumption, fitted well with data from Sweden and Finland from 1966 to 1971. The activity concentration of (210)Pb in the skeleton in man is modelled by using the results of studying the kinetics of lead in skeleton and blood in lead-workers after end of occupational exposure. The result of modelling (210)Pb and (210)Po activity in skeleton matched well with concentrations of (210)Pb and (210)Po in teeth from reindeer-breeders and autopsy bone samples in Finland. The results of (210)Po and (137)Cs in different tissues of wolf, wolverine and lynx previously published, are analysed with multivariate data processing methods such as Principal Component Analysis PCA, and modelled with the method of Projection to Latent Structures, PLS, or Partial Least Square Regression PLSR.

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