title: Modelling of long-term behaviour of caesium and strontium radionuclides in the Arctic environment and human exposure.
abstract: In this paper a compartment model of the highly vulnerable Arctic terrestrial food chain "lichen-reindeer-man" is outlined. Based upon an analysis of measured (137)Cs and (90)Sr contents in lichen and reindeer meat from 1961 up to 2001, site specific model parameters for two regions in north-western Arctic Russia and for Kautokeino municipality in Arctic Norway have been determined. The dynamics of radionuclide activity concentrations in the "lichen-reindeer-man" food chain for all areas was satisfactorily described by a double exponential function with short-term and long-term effective ecological half-lives between 1-2 and 10-12 years, respectively, for both (137)Cs and (90)Sr. Using parameter values derived from the model, life-time internal effective doses due to consumption of reindeer meat by reindeer-breeders after an assumed single pulse deposit of 1 kBq m(-2) of (137)Cs were estimated to be 11.4 mSv (Kola Peninsula), 5 mSv (Nenets Autonomous Area), and 2 mSv (Kautokeino, Norway). Differences in vulnerability to radiocaesium deposition were due to differences in transfer between lichen and reindeer and in diet between the three regions.
authors.affiliation: Institute of Radiation Hygiene, Mira str. 8, 197101 St. Petersburg, Russia. bazil@sg5816.spb.edu
authors.forename: Vladislav
authors.initials: V
authors.lastname: Golikov
authors.forename: Irina
authors.initials: I
authors.lastname: Logacheva
authors.forename: Gennadi
authors.initials: G
authors.lastname: Bruk
authors.forename: Vladimir
authors.initials: V
authors.lastname: Shutov
authors.forename: Mikhail
authors.initials: M
authors.lastname: Balonov
authors.forename: Per
authors.initials: P
authors.lastname: Strand
authors.forename: Sander
authors.initials: S
authors.lastname: Borghuis
authors.forename: Brenda
authors.initials: B
authors.lastname: Howard
authors.forename: Simon
authors.initials: S
authors.lastname: Wright
mesh_terms: D000818:Animals; D001110:Arctic Regions; D002588:Cesium Radioisotopes / Q000493:pharmacokinetics; D004032:Diet; D020387:Food Chain; D005506:Food Contamination; D006801:Humans; D008011:Lichens; D008962:Models, Theoretical; D011848:Radioactive Pollutants / Q000493:pharmacokinetics*; D012053:Reindeer; D018570:Risk Assessment; D013324:Strontium / Q000493:pharmacokinetics
chemical_list: D002588:Cesium Radioisotopes; D011848:Radioactive Pollutants; D013324:Strontium