Critical compilation and review of plant/soil concentration ratios for uranium,thorium and lead |
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| Institution: | 1. Oregon State University, Department of Nuclear Engineering and Radiation Health Physics, Corvallis, OR 97333, USA;2. Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;1. IP&D, University of Vale do Paraíba, São José dos Campos, Brazil;2. ReSoLVE Center of Excellence, Department of Physics, University of Oulu, Finland;3. Sodankylä Geophysical Observatory, University of Oulu, Finland;4. DGE, National Institute for Space Research, São José dos Campos, Brazil;5. LARAMG, University of Rio de Janeiro State, Rio de Janeiro, Brazil;1. GeoQuest and Wollongong Isotope Geochronology Lab, School of Earth and Environmental Sciences, University of Wollongong, Australia;2. Department of Physical Geography and Quaternary Geology, Stockholm University, 10691, Stockholm, Sweden;1. Dpt of Health Promotion, section of Legal Medicine, University of Palermo, Italy;2. Dpt of Health Promotion, section of Pathology, University of Palermo, Italy;3. Dpt of Radiology, University of Palermo, Italy |
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| Abstract: | The transfer of natural radionuclides of the U decay series through the biosphere is important, especially for assessment of the impacts of mining and milling of U ores. The pathway from soil through plants to humans can contribute significantly to the overall dose received from these radionuclides. Element-specific concentration ratios (CRs) used to model the impact of radionuclides have been reported for U, Th and Pb but have not received the research or critical review accorded other radionuclides associated with the nuclear industry. This paper compiles and analyses many of the available data on CRs for U, Th and Pb and recommends values appropriate for environmental assessments. A brief overview of the statistical properties of CR values and the complex soil/plant processes encompassed by this ratio is also given, as well as an overview of some of the physical, chemical and biological factors likely to influence CR values.Our analysis showed that CR values decreased significantly as the corresponding soil concentrations increased. Although the variability was substantial, with ranges of 1000- to 30 000-fold, CR values did differ significantly among some soil and plant types. The overall geometric means were 0·0045, 0·0036 and 0·052 for U, Th and Pb, respectively. |
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