Qassium University

Buraydah, Saudi Arabia

Qassium University

Buraydah, Saudi Arabia
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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.


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.


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.


El-Taher A.,Al Azher University | El-Taher A.,Qassium University | Makhluf S.,Al Azher University
Indian Journal of Pure and Applied Physics | Year: 2011

The natural radionuclides in limestone and alabaster found in Assuit Governorate in Upper Egypt have been investigated by passive gamma-ray spectrometry. From the measured X-ray spectra, specific activities were determined. The measured activity concentrations for these natural radionuclides were compared with the reported data from other countries. The radiation hazard parameters related to the exposure of limestone and alabaster have also been calculated. The obtained results of radium equivalent Raeq, level index Iγr, the external hazard index Hex and absorbed dose rate in limestone (90.44, 0.63, 0.17, 39.94) and (70.86, 0.50, 0.13, 31.55) are lower than the acceptable level 370 Bqkg-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. So limestone and alabaster can be used as building construction without exceeding the proposed radioactivity criterion level.


Shaaban E.R.,Qassium University | Shaaban E.R.,Assiut University
Physica B: Condensed Matter | Year: 2011

Glasses with compositions 70B2O330Bi 2O3 and 70B2O330PbO have been prepared and studied by differential thermal analysis (DTA). The crystallization kinetics of the glasses were investigated under non-isothermal conditions. From the dependence of glass-transition temperature (Tg) on heating rate, the activation energy for the glass transition was derived. Similarly the activation energy of the crystallization process was determined. Thermal stability of these glasses were achieved in terms of the characteristic temperatures, such as glass-transition temperature, Tg, onset temperature of crystallization, Tin, temperature corresponding to the maximum crystallization rate, Tp, beside the kinetic parameters, K(Tg) and K(Tp). The results revealed that 70B 2O330PbO is more stable than 70B2O 330Bi2O3. The crystallization mechanism is characterized for both 70B2O330Bi2O3 and 70B2O330PbO glasses (kinetic exponent n=2.06 for 70B2O330Bi2O3, and n=3.03 for 70B2O330PbO). The phases at which the glass crystallizes after the thermal process were identified by X-ray diffraction. © 2010 Elsevier B.V. All rights reserved.


El-Taher A.,Al - Azhar University of Egypt | El-Taher A.,Qassium University | Abbady A.G.E.,South Valley University
Indian Journal of Pure and Applied Physics | Year: 2012

The natural radionuclides 226Ra, 232Th and 40K contents in the Nile river sediments at various locations in Upper Egypt from Aswan to El-Minia have been investigated using gamma spectrometric analysis. Determination and measurement of radionuclide concentration are of great importance for assessment of external radiation dose received by man. The range and mean values of 226Ra, 232Th and 40K activity concentrations are 13-42(29), 10-67 (45) and 74-139 (123) Bq kg -1, respectively. These results are found to be in agreement with those reported data for Egyptian soil as 17(5-64), 18 (2-96) and 320 (29-650) Bq/kg dry weight (UNSCEAR, 2000). The mean radium equivalent (Ra eq) and dose rates are 100.21± 10.01 Bq kg -1, 44.88±6.69 n Gy h -1, respectively. The measured activity concentrations differ widely as their presence in the Nile river depends on the pertinent environmental situation such as the presence of dams, barrages and sediments type. The other factors controlling the distribution of the detected natural radioisotopes have been discussed.


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.


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.


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

The present work deals with identifying and determining the activity levels of natural occuring radionuclides, 226Ra and 232Th series, their decay products and 40K, in chemical and organic fertilizers used in Kingdom of Saudi Arabia. A total of 30 samples: 20 phosphatic fertilizers (single super-phosphate SSP and triple super-phosphate,TSP) and 10 organic fertilizers (cow, sheep and chicken) collected from markets and farms. The gamma-ray spectrometer consists of NaI(Tl) detector and its electronic circuit was used for measuring γ-ray spectra. The ranges of radioactivity levels of 226Ra, 232Th and 40K in chemical fertilizers are 51.5±5.2-106.3±7.5, 5.1±1.6-9.9±3.2. and 462.6±21-607.3±14Bqkg -1, respectively. The activities of 226Ra, 232Th and 40K in natural fertilizers (cow, sheep and chicken) are lower than the activities in chemical fertilizers. The obtained data are compared with available reported data from other countries in literature. The Ra eq in chemical fertilizer ranges from 100.37 to 161.43Bqkg -1 and in organic fertilizer ranges from 34.07 to 102.19Bqkg -1, which are lower than the limit of 370Bqkg -1 adopted from NEA-OECD (1979). The average heavy metal (Pb, Cd, Ni, Co and Cr) contents of the fertilizers marketed in the Kingdom of Saudi Arabia are also determined and within the limits of those used worldwide. © 2011 Elsevier Ltd.


El-Taher A.,Al Azher University | El-Taher A.,Qassium University
Radiation Protection Dosimetry | Year: 2011

Representative environmental samples (sandy soil, limestone, marble and gravels) collected from Wadi El Assuity, protective area, Assuit governorate in Upper Egypt have been investigated radiometrically using NaI (Tl) gamma-ray spectrometer. The specific activity of the radionuclides in Bq kg-1 for soil ranged between 10.5 and 18.7 for 226Ra, 1.5 to 4.6 for 232Th and from 94 to 107 for 40 K, for limestone ranged between 19 and 27.1 for 226Ra, 32.9 to 50 for 232Th and from 49 to 7 3 for 40 K, where, for marble ranged between 12.2 and 30.7 for 226Ra, 32.6 to 59.5 for 232 Th and 55 to 70 for 40 K and for gravels ranged between 7.8 and 21.8 for 226Ra, 19.8 to 30.0 for 232Th and from 151 to 260 for 40 K. The mean activity concentrations of measured radionuclides were compared with other literature values. The absorbed dose rate, radium equivalent activity and external hazard index were calculated and compared with internationally recommended values. The gamma absorbed dose rates in the samples ranged between 8.44 and 50.89 nGy h -1 . These dose rates are consistent with the accepted worldwide average 55 nGy h -1 for the public. All values obtained for radium equivalent activity are <370 Bq kg -1 , which are acceptable for safe use. The calculated values of external hazard index obtained varied from 0.12 to 0.24. Since these values are lower than unity, one can say that the radiation hazard is insignificant for the population living in the investigated area. This permits the use of these materials sediments as building materials in any probable development projects at this area. © The Author 2010. Published by Oxford University Press. All rights reserved.

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