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External radiation doses from 137Cs to frog phantoms in a wetland area: in situ measurements and dose model calculations

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Abstract

For assessment of external radiation doses to frogs in a wetland area contaminated with 137Cs, frog phantoms were constructed from polymethyl methacrylate (PMMA). The frog phantoms contained thermoluminescence (TL) chips and were used in situ at two study sites to measure doses. To test if higher doses are received by the sensitive skin of frogs, extra-thin TL chips were applied close to the surface of the frog phantoms. In addition, the measured doses were compared with those calculated on the basis of soil sample data from the wetland multiplied with dose-conversion coefficients from the US Department of Energy’s RESRAD-BIOTA code and from the ERICA assessment tool. Measured doses were generally lower than those calculated to ellipsoids used to model frogs. Higher doses were measured at the frog phantoms’ surfaces in comparison to inner parts at one of the two sites indicating that the frogs’ thin skin could receive a higher radiation dose than expected. In the efforts to assure protection of non-human biota, in situ measurements with phantoms provide valuable dose information and input to dose models in site-specific risk assessments of areas contaminated with radionuclides.

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Acknowledgments

This study was financed by the Swedish Radiation Protection Authority, SSI. We are grateful to Petra Wallberg and Clare Bradshaw for reading early versions of the manuscript, and to Inger Östergren and Lena Wallberg who provided assistance and expertise in soil sampling and activity measurements. Also, Torbjörn Nylén provided valuable assistance and expertise in the field work.

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Authors and Affiliations

  1. Department of Systems Ecology, Stockholm University, 106 91, Stockholm, Sweden

    K. Stark

  2. Department of Radiation Physics, Linköping University, 581 85, Linköping, Sweden

    H. B. L. Pettersson

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  1. K. Stark
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  2. H. B. L. Pettersson
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Correspondence to K. Stark.

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Stark, K., Pettersson, H.B.L. External radiation doses from 137Cs to frog phantoms in a wetland area: in situ measurements and dose model calculations. Radiat Environ Biophys 47, 481–489 (2008). https://doi.org/10.1007/s00411-008-0185-9

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  • DOI: https://doi.org/10.1007/s00411-008-0185-9

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