Radiometric, SEM and XRD investigation of the Chituc black sands, southern Danube Delta, Romania
| Autor: | Delia Dumitras, Adriana Ion, A.M. Blebea-Apostu, Carmen Costea, Aurelia Celarel, Claudia-Mariana Gomoiu, Octavian G. Duliu, Romul Margineanu |
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| Rok vydání: | 2014 |
| Předmět: |
Geologic Sediments
Health Toxicology and Mutagenesis chemistry.chemical_element Mineralogy X-Ray Diffraction Radiation Monitoring Environmental Chemistry Background Radiation Soil Pollutants Radioactive Waste Management and Disposal Shore Radioisotopes geography geography.geographical_feature_category Romania Thorium Spectrometry X-Ray Emission General Medicine Uranium Pollution Spectrometry Gamma Black sand chemistry Monazite Microscopy Electron Scanning Radiometric dating Geology Zircon |
| Zdroj: | Journal of environmental radioactivity. 138 |
| ISSN: | 1879-1700 |
| Popis: | The black sand of the Chituc marine sand bank, northern of the city of Navodari (Romania), presents anomalous high radioactivity. Field measurements recorded in some places dose rate up to 200 nSv/h, significantly overpassing the average value of 44 ± 20 nSv/h along the entire Southern sector of Romanian Black Sea shore. Gamma ray spectrometry performed on both Slanic-Prahova Underground Low Background Laboratory and Geological Institute of Romania Radiometric Facilities showed with clarity the dominance of 228Ac radioisotope in the 50 microns fraction together with the 226Ra and traces of 40K. No significant amount of anthropogenic 137Cs was identified. Based on radiometric as well as on SEM–EDAX and XRD determinations we come to the conclusion that the evidenced radioactivity could be attributed to both uranium and thorium series in the zircon and monazite fractions and to a lesser extent to potassium in the feldspars. |
| Databáze: | OpenAIRE |
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