Browsing by Author "Abdelaziz T.D."

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Characterization by optical and magnetic spectroscopy of a synthesized SiO2 thin film used for radiation detector
(Scientific Publishers, 2017) Abdelaziz T.D.; Ezz-Eldin F.M.; October University for Modern Sciences and Arts (MSA University); Faculty of Biotechnology; Basic Sciences Department; 6th October City; Egypt; National Center for Radiation Research and Technology; Atomic Energy Authority; Cairo; Egypt; Chemistry Department; Foundation Academy for Sciences and Technology (FAST); Batterjee Medical College (BMC); Jeddah; Saudi Arabia
This work reports the synthesis and characterization of silica glass prepared by sol�gel procedure and finds out the effects of doses of gamma irradiation on the steps route of the heat-treated sample at 600 and 1100��C. Combined characterizations of the glassy samples have been carried out by optical absorption and electron paramagnetic resonance. Also, FT infrared absorption spectra have been measured for both the heat-treated samples before and after gamma irradiation. Optical absorption spectra have identified an absorption band at 212�215�nm beside a broad band at 230�265�nm and the correlation of E? center with heat-treatment and gamma irradiation have been followed. FT infrared absorption spectra indicate the bands within near IR region representing the vibrational modes due to water, OH and SiOH within the wavenumber range 2500�3700�cm?1 are affected by heat treatment due to the elimination of organic residue and amount of OH and water. ESR investigations confirm the results obtained from optical and FTIR measurements. It is concluded from the collective data that sol�gel silica glass can serve as acceptable candidate for gamma-rays irradiator and gamma chamber dosimetry. � 2017, Indian Association for the Cultivation of Science.
Optical and FT Infrared spectral studies of vanadium ions in cadmium borate glass and effects of gamma irradiation
(European Journal of Economics, Finance and Administrative Sciences, 2014) Abdelaziz T.D.; Ezzeldin F.M.; El Batal H.A.; Abdelghany A.M.; October University for Modern Sciences and Arts; MSA University; 6 October City; Egypt; National Center for Radiation Research and Technology; Nasr City; Cairo; Egypt; Glass Research Dept.; National Research Center; Dokki 12311; Egypt; Spectroscopy Dept.; Physics Division; National Research Center; Dokki 12311; Egypt
Combined optical and infrared absorption spectra of V2O 5-doped cadmium borate glasses were investigated before and after gamma irradiation with a dose of 8 Mrad (=8 � 104 Gy). The undoped base cadmium borate glass reveals a spectrum consisting of strong charge transfer UV absorption bands which are related to the presence of unavoidable contaminated trace iron impurities (mainly Fe3+). The V 2O5-doped glasses reveal an extra band at 380 nm and the high V2O5-content glass also shows a further band at about 420 nm. The observed optical spectrum indicates the presence of vanadium ions mainly in the pentavalent state (d0 configuration). The surplus band at 420 nm shows that some trivalent vanadium ions are identified at high V 2O5 content. The optical spectra of the glasses after gamma irradiation show small decrease of the intensity of the UV absorption which are interpreted by assuming the transformation of some Fe3+ ions by photochemical reactions with the presence of high content (45 mol%) of heavy massive CdO causing some shielding behavior. FT infrared absorption spectra of the glasses show vibrational bands due to collective presence of triangular and tetrahedral borate groups in their specific wavenumbers. The FTIR spectra are observed to be slightly affected by both the V2O 5-dopants being present in modifying low percent or gamma irradiation due to the presence of high content heavy CdO. � 2014 Elsevier B.V. All rights reserved.