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Buraydah, Saudi Arabia

El-Taher A.,Al Azher University | El-Taher A.,Qassium University
Applied Radiation and Isotopes | Year: 2010

Neutron activation analysis (NAA) is one of the most powerful analytical techniques for multielement determination of rocks. In the present work NAA and HPGe detector γ-spectroscopy was used to determine chromium and 15 minor and trace elements qualitatively and quantitatively from chromite rock samples collected from El-Robshi area in the Eastern Desert, Egypt. The samples were properly prepared together with their standards and simultaneously irradiated by thermal neutrons at the TRIGA Mainz research reactor. Short time irradiation (1-5min) was used to determine Mg, Ti and Mn. Long time irradiation (6h) was used to determine Na, Ga, As, La, Sc, Cr, Fe, Co, Zn, Zr, Ce, Ce, Yb, Lu, Hf and Ta. In El-Robshi chromite comprises 18 sites, more than 100 lenses of massive chromite, more than 2700 tons averaging 44% Cr 2O 3 and the average of 51Cr 40.2%. © 2010 Elsevier Ltd. Source


El-Taher A.,Assiut University | El-Taher A.,Qassium University | Makhluf S.,Assiut University | Nossair A.,Assiut University | Abdel Halim A.S.,Egypt Atomic Energy Authority
Applied Radiation and Isotopes | Year: 2010

The cement industry is considered as one of the basic industries that plays an important role in the national economy of developing countries. Activity concentrations of 226Ra, 232Th and 40K in Assiut cement and other local cement types from different Egyptian factories has been measured by using γ-ray spectrometry. From the measured γ-ray spectra, specific activities were determined. The measured activity concentrations for these natural radionuclides were compared with the reported data for other countries. The average values obtained for 226Ra, 232Th and 40K activity concentration in different types of cement are lower than the corresponding global values reported in UNSCEAR publications. The obtained results show that the averages of radiation hazard parameters for Assiut cement factory are lower than the acceptable level of 370 Bq kg-1 for radium equivalent Raeq, 1 for level index Iγr, the external hazard index Hex ≤1 and 59 (nGy h-1) for absorbed dose rate. The manufacturing operation reduces the radiation hazard parameters. Cement does not pose a significant radiological hazard when used for construction of buildings. © 2009 Elsevier Ltd. All rights reserved. Source


El-Taher A.,Al Azher University | El-Taher A.,Qassium University | Makhluf S.,Al Azher University
Indian Journal of Pure and Applied Physics | Year: 2010

The contents of natural radionuclides (226Ra, 232Th and 40K) were measured in phosphate and super phosphate used and product in Assuit fertilizer factory in upper Egypt by using low level gamma spectrometry. Phosphate is the main material used for the fertilizers. The phosphate samples were collected from El-Sebayia, Abo Tartour and El-Shaghab. The results are discussed and compared with the levels in phosphate rocks from different countries. The average values obtained for 226Ra, 232Th and 40K activity concentration in different types of phosphate are lower than the corresponding global values reported in UNSCAIR publications. The obtained results show that the averages of radiation hazard parameters for the phosphate and super phosphate are lower than the acceptable level 370 Bq.kg-1 for radium equivalent Raeq, 1 for level index Ir, the external hazard index Hex ≤ 1 and 59 (nGy.h-1) for absorbed dose rate. Source


El-Taher A.,Al Azher University | El-Taher A.,Qassium University
Applied Radiation and Isotopes | Year: 2012

The instrumental neutron activation analysis technique (INAA) was used for qualitative and quantitative analysis of granite samples collected from four locations in the Aswan area in South Egypt. The samples were prepared together with their standards and simultaneously irradiated in a neutron flux of 7×10 11n/cm 2s in the TRIGA Mainz research reactor. Gamma-ray spectra from an hyper-pure germanium detector were analyzed. The present study provides the basic data of elemental concentrations of granite rocks. The following elements have been determined Na, Mg, K, Fe, Mn, Sc, Cr, Ti, Co, Zn, Ga, Rb, Zr, Nb, Sn, Ba, Cs, La, Ce, Nd, Sm, Eu, Yb, Lu, Hf, Ta, Th and U. The X-ray fluorescence (XRF) was used for comparison and to detect elements, which can be detected only by XRF such as F, S, Cl, Co, Cu, Mo, Ni, Pb, Se and V. The data presented here are our contribution to understanding the elemental composition of the granite rocks. Because there are no existing databases for the elemental analysis of granite, our results are a start to establishing a database for the Egyptian granite. It is hoped that the data presented here will be useful to those dealing with geochemistry, granite chemistry and related fields. © 2011 Elsevier Ltd. Source


El-Taher A.,Al - Azhar University of Egypt | El-Taher A.,Qassium University | Madkour H.A.,National Institute of Oceanography and Fisheries of Egypt
Isotopes in Environmental and Health Studies | Year: 2014

Analysis of marine sediments of the studied localities provides investigators with data to characterise the composition of these sediments allowing for the identification of particular pollution sources. A study of texture, geochemistry, X-ray diffraction and natural radionuclide content of shallow marine sediments from Quseir harbour, Safaga harbour and El-Esh area in the Red Sea coast of Egypt was conducted for the purpose of assessing the possible influence of human activities on the composition of the sediments. The activity concentrations of the naturally occurring radionuclides 226Ra, 232Th and 40K were measured by using γ-ray spectrometry. The mean activity concentrations of 226Ra, 232Th and 40K in all areas studied were found to be 71±6, 66±5 and 92±7 Bq kg-1 for 226Ra, 83±5, 71±7 and 162±23 Bq kg-1 for 232Th and 513±10, 493±20 and 681±28 Bq kg-1 for 40K, respectively. The results of the study presented were compared with corresponding results obtained in other coastal and aquatic environments in the Red Sea. © 2013 © 2013 Taylor & Francis. Source

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