Uptake of radionuclides and stable elements from paddy soil to rice: a review
| Autor: | Y.H. Choi, Keiko Tagami, Z.R. Shang, Shigeo Uchida |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Radioisotopes
Radionuclide Oryza sativa biology Bran Health Toxicology and Mutagenesis food and beverages Soil classification Oryza General Medicine biology.organism_classification Elements Pollution Agronomy Environmental Chemistry Environmental science Paddy field Soil Pollutants Radioactive Brown rice Poaceae Waste Management and Disposal |
| Zdroj: | Journal of environmental radioactivity. 100(9) |
| ISSN: | 1879-1700 |
| Popis: | The critical paths for radionuclides and the critical foods in Asian countries differ from those in Western countries because agricultural products and diets are different. Consequently, safety assessments for Asian countries must consider rice as a critical food. As most rice is produced under flooded conditions, the uptake of radionuclides by rice is affected by soil conditions. In this report, we summarize radionuclide and stable element soil-to-plant transfer factors (TFs) for rice. Field observation results for fallout (137)Cs and stable Cs TFs indicated that while fallout (137)Cs had higher TF than stable Cs over several decades, the GM (geometric mean) values were similar with the GM of TF value for (137)Cs being 3.6 x 10(-3) and that for stable Cs being 2.5 x 10(-3). Although there are some limitations to the use of TF for stable elements under some circumstances, these values can be used to evaluate long-term transfer of long-lived radionuclides in the environment. The compiled data showed that TF values were higher in brown rice than in white rice because distribution patterns for elements were different in the bran and white parts of rice grains. |
| Databáze: | OpenAIRE |
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