EE- Nükleer Araştırmalar Lisansüstü Programı - Yüksek Lisans
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ÖgeComparison of beta, neutron and gamma attenuation properties of pmma/colemanite composites(Energy Institute, 2019-11-13) Mehranpour, Shima ; Baydoğan, Nilgün ; Nuclear Studies ; Nükleer AraştırmalarPoly (methyl methacrylate) (PMMA) is a thermoplastic material with high resistivity against abrasion and heat. PMMA material has great thermal, mechanical and radiation shielding properties which can be improved by the addition of colemanite filler. Based on superior structural properties of PMMA material and the addetives (colemanite filler), the produced PMMA based polymer composites can be used in different application areas such as the aviation and aerospace field. These new materials have significant advantages such as high durability and high strength. PMMA is a transparent thermoplastic polymer material from the acrylate family. PMMA reinforced by colemanite filler has great importance in various applications ranging from large scales to small scales. Three main polymerization methods that can be used in the production of PMMA polymer composites are solution-mixing, melt-compounding and in-situ polymerization. The Atom Transfer Radical Polymerization (ATRP) method was used to disperse colemanite filler into PMMA material, in this study. Colemanite was used to enhance the radiation shielding properties of PMMA. Beta, neutron and gamma transmission techniques were applied to investigate the behavior of PMMA/Colemanite composite samples against radiation. Cs-137 and Co-60 were used as gamma source, Sr-90 was utilized as beta source and Pu-Be neutron Howitzer (NH3) was used in neutron transmission test. PMMA/Colemanite composite samples were produced at three different concentrations of colemanite and irradiated for determined duration, then the linear attenuation coefficient values were calculated for Cs-137, Co-60 and Sr-90 radioisotopes and the total macroscopic cross-sections values were evaluated for neutron source with the rise of colemanite content in samples. The results indicated that by the rise of colemanite concentration, the linear attenuation coefficients and the mass attenuation coefficients were increased slowly. Based on this fact, it is possible to improve the radiation shielding properties of PMMA based polymer by the addition of colemanite as a filler.