TY - JOUR

T1 - Levels and transfer of 210Po and 210Pb in Nordic terrestrial ecosystems

A1 - Brown,J.E.

A1 - Gjelsvik,R.

A1 - Roos,Per

A1 - Kålås,J.A.

A1 - Outola,I.

A1 - Holm,E.

AU - Brown,J.E.

AU - Gjelsvik,R.

AU - Roos,Per

AU - Kålås,J.A.

AU - Outola,I.

AU - Holm,E.

PB - Elsevier Ltd.

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - Radiation research and nuclear technologies

KW - Radioecology and tracers

KW - Strålingsforskning og nukleare teknologier

KW - Radioøkologi og sporstoffer

U2 - 10.1016/j.jenvrad.2010.06.016

DO - 10.1016/j.jenvrad.2010.06.016

JO - Journal of Environmental Radioactivity

JF - Journal of Environmental Radioactivity

SN - 0265-931X

IS - 5

VL - 102

SP - 430

EP - 437

ER -