Radioecological modelling of Polonium-210 and Caesium-137 in lichen-reindeer-man and top predators. (June 2018)

• Record Type: Journal Article
• Authors: Persson, Bertil R.R.; Gjelsvik, Runhild; Holm, Elis
• Is Part Of: Journal of environmental radioactivity. Volume 186(2018)
• Page Start: 54
• Page End: 62
• Publication Date: 2018-06
• Subjects: Modelling -- Polonium-210 -- Caesium-137 -- Lichen -- Reindeer -- Reindeer herder -- Man -- Wolf -- Wolverine -- Lynx -- Principal component analysis PCA -- Partial least square regression PLSR; Radioactivity -- Periodicals; Radiation, Background -- Periodicals; Radioecology -- Periodicals; Radioactive pollution -- Periodicals; Environmental Pollutants -- Periodicals; Radioactive Pollutants -- Periodicals; Radioactivity -- Periodicals; Radioécologie -- Périodiques; Pollution radioactive -- Périodiques; Fond de rayonnement -- Périodiques; 539.752
• DOI: 10.1016/j.jenvrad.2017.08.006
• Languages: English
• ISSNs: 0265-931X

Abstract

Abstract: 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. Graphical abstract: Highlights: 210 Pb and 210 Po. Modelled in lichen to reindeer and man. 210 Po and 137 Cs in wolf, wolverine and lynx.