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Abstract The author wishes to express her deepest thanks and gratitude to Prof. Dr. Abdel-Gawad M. Rabie, Chemistry Dpartment-Faculty of Science, Ain Shams University and to Prof. Dr. Ahmed M. Dessouki, National Centre for Radiation Research and Technology for supervision, helpful discussions and guidance throughout this work. The Author would like to express her deepest thanks to Prof. Dr. H. Roushdy, Chairman the Atomic Energy Authority, for encouragement and help in various ways. Many thanks are also due to my colleagues at the National Centre for Radiation Research and Technology. |