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Spatial and temporal variations of uranium and thorium series along the Egyptian Mediterranean coast Saleh, I.H. (Department of Environmental Studies, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria (Egypt)); El-Gamal, A.A. (Department of Environmental Studies, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria (Egypt)); Nasr, S.M. (Department of Environmental Studies, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria (Egypt)); Naim, M.A. (Department of Physics, Faculty of Science, Alexandria University, Alexandria (Egypt)) Isotopes in environmental studies - Aquatic Forum 2004. Proceedings of an international conference. Unedited papers http://www-pub.iaea.org/MTCD/publications/PDF/CSP_26_web.pdf [en] Uranium and thorium series are the two dominant radioactive decay chains in the environment. Sediment samples were collected bimonthly for two years from the area extending from El-Salloum to El-Arish. Gamma measurements have been carried out by means of high-resolution low background PC multi-channel spectrometer, using a coaxial HPGe detector. The highest U and Th series member's concentrations have been recorded at Rashid as one of the high background areas in the world. Except at Rashid, U and Th series concentrations were found to be at natural levels in all the other stations. The average concentrations along the coast during the monitoring period for 234Th, 226Ra, 214Pb and 214Bi as uranium series were 21.03, 19.49, 13.70 and 13.06 Bq/kg, respectively and for 228Ac, 212Pb, 212Bi and 208Tl as thorium series were 13.75, 10.40, 9.38 and 5.22 Bq/kg, respectively. The activity ratio of 228Ac/208Tl was approximately equal three for the majority of sediment samples. The concentration values of 212Pb were shown to be close to the corresponding concentration values of 212Bi and also between 214Pb and 214Bi. Moreover, the values of the Th series are looking lower than the values of the uranium series. Generally, the lowest Th series values have been detected mainly in the western sector stations except at El-Salloum. The concentration of uranium and thorium is dependent on the calcium carbonate content, grain size composition of the sediments and marine biological activities Primary Subject Source
ENVIRONMENTAL SCIENCES (S54) International Atomic Energy Agency, Vienna (Austria); Abdus Salam International Centre for Theoretical Physics, Trieste (Italy); International Hydrological Programme (IHP) of UNESCO, Paris (France); Intergovrnmental Oceanographic Commission (IOC) of UNESCO, Paris (France); Commission Internationale pour l'Exploration Scientifique de la Mer Mediterranee (CIESM), Monte Carlo (Monaco); 713 p; ISBN 92-0-111305-X; ; Feb 2006; p. 452-454; Aquatic Forum 2004: International conference on isotopes in environmental studies; Monte Carlo (Monaco);
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25-29 Oct 2004; IAEA-CN--118/113P; ISSN 1562-4153; ; Also available online: http://wwwpub.iaea.org/MTCD/publications/PDF/CSP_26_web.pdf; For availability on CD-ROM, please contact IAEA, Sales and Promotion Unit, E-mail:
[email protected]; Web site: http://www-pub.iaea.org/MTCD/publications/publications.asp/; 2 refs, 2 figs Report IAEA-CSP--26/P International Atomic Energy Agency (IAEA) ACTINIUM 228, BISMUTH 212, BISMUTH 214, CALCIUM CARBONATES, HIGH-PURITY GE DETECTORS, LEAD 212, LEAD 214, RADIOECOLOGICAL CONCENTRATION, RADIOECOLOGY, RADIUM 226, SEDIMENTS, SHORES, THALLIUM 208, THORIUM, THORIUM 234, URANIUM ACTINIDE NUCLEI, ACTINIDES, ACTINIUM ISOTOPES, ALKALINE EARTH ISOTOPES, ALKALINE EARTH METAL COMPOUNDS, ALPHA DECAY RADIOISOTOPES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BISMUTH ISOTOPES, CALCIUM COMPOUNDS, CARBON 14 DECAY RADIOISOTOPES, CARBON COMPOUNDS, CARBONATES, COASTAL REGIONS, DAYS LIVING RADIOISOTOPES, ECOLOGICAL CONCENTRATION, ECOLOGY, ELEMENTS, EVEN-EVEN NUCLEI, GE SEMICONDUCTOR DETECTORS, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, HOURS LIVING RADIOISOTOPES, INTERNAL CONVERSION RADIOISOTOPES, ISOTOPES, LEAD ISOTOPES, MEASURING INSTRUMENTS, METALS, MINUTES LIVING RADIOISOTOPES, NUCLEI, ODD-ODD NUCLEI, OXYGEN COMPOUNDS, RADIATION DETECTORS, RADIOISOTOPES, RADIUM ISOTOPES, SEMICONDUCTOR DETECTORS, THALLIUM ISOTOPES, THORIUM ISOTOPES, YEARS LIVING RADIOISOTOPES English 37050123 37043480 2006 37 21
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