Concentration ratios for small mammals collected from the exposed sediments of a 137Cs contaminated reservoir
| Autor: | G. Timothy Jannik, Michael H. Paller, Lynn D. Wike |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Geologic Sediments
South Carolina Health Toxicology and Mutagenesis Fresh Water Bioconcentration Concentration ratio Animal science Dry weight Animals Soil Pollutants Radioactive Environmental Chemistry Sigmodontinae Cotton rat Waste Management and Disposal Hydrology Radionuclide biology Arvicolinae Transfer factor General Medicine Sigmodon hispidus biology.organism_classification Pollution Peromyscus gossypinus Cesium Radioisotopes Body Burden Environmental Monitoring |
| Zdroj: | Journal of Environmental Radioactivity. 90:224-235 |
| ISSN: | 0265-931X |
| Popis: | (137)Cs concentration ratios were computed for small mammals collected from the dried sediments of a partially drained, contaminated reservoir. Soil (137)Cs activity concentrations were heterogeneous on small and large spatial scales and had a geometric mean of 253 (range 23-2110) Bq/kg dry weight. Mean (137)Cs activity concentrations in composite cotton rat Sigmodon hispidus and cotton mouse Peromyscus gossypinus samples averaged 2480 (range 556-6670) and 471 (range 96-1000) Bq/kg whole body dry weight, respectively. About 50% of the variance in cotton rat tissue (137)Cs activity was explained by variation in soil (137)Cs activity. Soil-to-animal dry weight concentration ratios averaged 6.0 for cotton rats and 1.2 for cotton mice and were generally similar to (137)Cs concentration ratios for herbivorous, homeothermic animals from other contaminated ecosystems. In the RESRAD-BIOTA dose model, the default wet-weight concentration ratio for (137)Cs in terrestrial animals is 110 resulting in an estimate of internal and external radiation doses to terrestrial biota that is 44 times more than the dose calculated with the actual measured wet-weight concentration ratio for cotton rats (1.6). These results show that site-specific concentration ratios can significantly affect the estimation of dose. |
| Databáze: | OpenAIRE |
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