Document Details
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Document Type |
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Thesis |
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Document Title |
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reparation and Development of Polyester Nanocomposites for Radiology Shielding Applications تصنيع وتطوير بعض مركبات البوليستر المتناهية في الصغر لتطبيقات الحماية الإشعاعية الطبية |
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Subject |
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Faculty of Science |
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Document Language |
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Arabic |
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Abstract |
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Shielding against ionizing radiation is considered a crucial issue for radiation safety of patients and workers at radiology centers. In this work, the shielding appropriateness of the modified pure polyester polymer coating, lead oxide/Polyester nanocomposite and titania-bismuth-borotellurite glass system has been investigated at the diagnostics energy ranges. Polyester nanocomposite embedded by lead oxide (Pb3O4) nanopowder in different concentrations 10%, 20 %, 30 % and 40 % weight percentages mixed with polyester matrix. Polyester polymer nanocomposites were prepared using the open mould cast technique. It was investigated for their abilities in shielding ionizing radiation for medical diagnostic radiology; they were tested using x-rays at different tube voltages (40, 80 and 120kVp) at diagnostic range. Physical properties of all samples were investigated using different techniques such as x-ray diffraction, scanning electron microscope (SEM) and Transform Infrared Spectroscopy (FTIR). The linear attenuation coefficient (LAC) and half value layer (HVL) of the samples were determined. The results showed that all the samples considered in this work are potential shielding materials that could be used for medical application. On the other hand, for comparison purpose, tellurite glass system (TiO2-Bi2O3-B2O3-TeO2) was selected to compare it with prepared polyester polymer nanocmposites. The physical properties of these glass were obtained from the literatures. It was characterized by its high density of their composites and their non-toxic material that makes it has a supreme reputation in radiation shielding. A comparison of shielding characteristics between the glass samples and the frequently used shielding materials at radiology centers like lead glass and ordinary concrete is implemented. To achieve this aim, XMuDat and WinXCom programs have been utilized to compute the mass attenuation coefficients (µ/ρ)m of the lead glass, ordinary concrete and glass samples of the mentioned system. The selected incident photon beams are divided into therapeutic average photon energies 1250 and 662keV that resulted from-ray sources Co-60 and Cs-137 based therapy level bunkers, respectively, and x-ray diagnostic radiology at the average energies 60, 40, 30 and 20keV. Additional shielding parameters like half value layers (HVL), effective atomic numbers (Zeff) are also evaluated.
Outcome results revealed that the high content of lead oxide in polyester nanocomposite (40% weight percentage of Pb3O4 ) and Bi2O3 in glass sample 30Te are the best shielding materials for both diagnostic bunkers. However, HVL was found to be few millimeters in polymer composite in comparison with glass system shield and lead glass.
As a conclusion of our results, production of optimum radiation shielding materials of new Pb3O4/polyester nanocomposite was achieved for medical applications with strong consideration for weight, flexibility, cost, toxicity, environmentally friendliness and other relevant properties. The new polyester nanocomposite coating could be advantageous as it is considered radiation shielding that replace the lead glass and ordinary concrete of large thicknesses at radiology centers. |
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Supervisor |
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Dr. Hossam Donya |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1441 AH
2019 AD |
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Added Date |
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Monday, October 7, 2019 |
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Researchers
| سالم عويض السلمي | Alsulami, Salem Owaidh | Researcher | Master | |
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