Assessment of natural radioactivity levels and identification of minerals in Brahmaputra (Jamuna) river sand and sediment, Bangladesh
| Autor: | Syed Mohammad Azharul Islam, Farah Deeba, Md. Nazrul Islam Khan, Debasish Paul, M. A. Haydar, Ratan Kumar Majumder, Md. Zafrul Kabir, MI Ali, Md. Ibrahim Khalil |
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| Rok vydání: | 2016 |
| Předmět: |
Radionuclide
020209 energy Geography Planning and Development Mineralogy chemistry.chemical_element Sediment 02 engineering and technology Management Monitoring Policy and Law Uranium 010403 inorganic & nuclear chemistry Feldspar 01 natural sciences Effective dose (radiation) 0104 chemical sciences Radium chemistry visual_art Monazite Environmental chemistry 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Geology Zircon |
| Zdroj: | Radiation Protection and Environment. 39:204 |
| ISSN: | 0972-0464 |
| DOI: | 10.4103/0972-0464.199980 |
| Popis: | Distribution of the natural radionuclides (238 U,232 Th, and 40 K) and their specific activities in sands and sediments of the Brahmaputra (Jamuna) river of Bangladesh together with mineral characteristics has been studied to assess the radiation levels as well as to develop a baseline database for comparison in the future in case of any change in the area under study due to anthropogenic activities. The radiological parameters of natural radioactivity were assessed calculating the radium equivalent activity, hazard index, the absorbed dose rate, and annual effective dose. The average activity concentrations of 226 Ra (238 U),232 Th, and 40 K in sand and sediment were found to be 59 ± 2 & 60 ± 2 Bq/kg, 113 ± 5 & 135 ± 5 Bq/kg, and 983 ± 42 & 1002 ± 43 Bq/kg, respectively. The calculated average absorbed dose rate and annual effective dose were found to be 150 nGy/h and 0.18 mSv/year respectively. These high values are associated with mineral content of the sediment. X-ray diffraction peaks of sand and sediment samples identify quartz, feldspar, rutile, zircon, monazite, uranium fluoride, hematite, kyanite, and uranium arsenide minerals to be present in the samples. |
| Databáze: | OpenAIRE |
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