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Risk from radionuclides: a frog's perspective: Accumulation of 137Cs in a riparian wetland, radiation doses, and effects on frogs and toads after low-dose rate exposure
Stockholm University, Faculty of Science, Department of Systems Ecology.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Threats from man-made radionuclides include waste issues, increasing number of power plants, underground bomb testing, nuclear weapons, and “dirty bombs”. Until recently the ionizing radiation protection system focused on protecting humans with an implied protection of biota. However, goals of sustainable development and precautionary principles for human activity are leading to an inclusion of plant and animal populations in the protection system.

From this perspective, the present thesis examines wetlands that function as sinks for the radionuclide 137Cs, and describes calculated and measured radiation doses to residing biota. Also, multi-level effects from exposure to low-dose rate ionizing radiation were studied. Accumulation of 137Cs after the Chernobyl accident fallout was studied in a riparian wetland with a mean activity concentration of 1 200 kBq m-2 in Sweden (paper I). A mass balance budget of 137Cs showed that the sedimentation of new material was balanced by the decay process of 137Cs in parts of the wetland (paper I).

Frogs were identified as organisms of concern in this wetland. Internal radiation doses, based on whole body measurements of frogs, were estimated to be lower than external doses based on soil samples (paper II). Current dose models for biota resulted in a wide range of doses depending on different levels of conservatism in the models. Therefore, in situ measurements with frog-phantoms were found to provide valuable dose information (paper III). Measured doses using frog-phantoms were lower than calculated doses using several dose models. Although a dose conversion factor by FASSET was found to be useful for comparison with measurements in the field. A higher dose was measured to the phantom surface in comparison to inner parts, i.e. the sensitive skin of frogs receives the highest dose. Estimated and measured radiation doses to frogs were below suggested dose rate limits.

Low-dose rate 137Cs exposure of eggs and tadpoles from three amphibian species, Scaphiopus holbrookii, Bufo terrestris, and Rana catesbeiana, showed no increased levels of strand breaks in red blood cells, and no effects on development, survival or growth up to metamorphosis (paper IV). The ecological factor larval density had a stronger effect on metamorphic traits than low-dose rate radiation. Higher levels of strand breaks were detected after an acute dose in R. catesbeiana than after a chronic dose supporting a dose rate limit for protection of amphibians rather than a dose limit (paper IV).

Based on current knowledge, frogs in the contaminated wetland are probably not exposed to radiation doses from 137Cs that are harmful for the population. However, variations in sensitivity between populations and species, and adaptive responses have been shown for amphibians exposed to other stressors. This supports further research on effects of chronic low-dose rates of ionizing radiation on amphibians.

Place, publisher, year, edition, pages
Stockholm: Systemekologiska institutionen , 2006. , 34 p.
Keyword [en]
dose model, mass balance budget, overbank sedimentation, amphibian, phantom, thermoluminescence chip, radiosensitivity, DNA damage
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-1318ISBN: 91-7155-327-4 (print)OAI: oai:DiVA.org:su-1318DiVA: diva2:189863
Public defence
2006-11-08, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2006-10-18 Created: 2006-10-18Bibliographically approved
List of papers
1. Post-depositional redistribution and gradual accumulation of 137Cs in a riparian wetland ecosystem in Sweden
Open this publication in new window or tab >>Post-depositional redistribution and gradual accumulation of 137Cs in a riparian wetland ecosystem in Sweden
2006 In: Journal of Environmental Radioactivity, Vol. 87, 175-187 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22986 (URN)
Note
Part of urn:nbn:se:su:diva-1318Available from: 2006-10-18 Created: 2006-10-18Bibliographically approved
2. Estimation of radiation doses from 137Cs to frogs in a wetland ecosystem
Open this publication in new window or tab >>Estimation of radiation doses from 137Cs to frogs in a wetland ecosystem
2004 In: Journal of Environmental Radioactivity, Vol. 75, 1-14 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-22987 (URN)
Note
Part of urn:nbn:se:su:diva-1318Available from: 2006-10-18 Created: 2006-10-18Bibliographically approved
3. External radiation doses from 137Cs to frog-phantoms in a wetland area: in situ measurements and dose model calculations
Open this publication in new window or tab >>External radiation doses from 137Cs to frog-phantoms in a wetland area: in situ measurements and dose model calculations
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-22988 (URN)
Note
Part of urn:nbn:se:su:diva-1318Available from: 2006-10-18 Created: 2006-10-18 Last updated: 2010-01-13Bibliographically approved
4. Multi-level effects of low-dose rates of ionizing radiation on amphibians after exposure to 137Cs
Open this publication in new window or tab >>Multi-level effects of low-dose rates of ionizing radiation on amphibians after exposure to 137Cs
Show others...
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-22989 (URN)
Note
Part of urn:nbn:se:su:diva-1318Available from: 2006-10-18 Created: 2006-10-18 Last updated: 2010-01-13Bibliographically approved

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