Çeşitli katkı maddeleriyle sentezlenen plastik sintilatör örneklerinin karakterizasyonu

Plastic scintillators are commonly used in radiation detection due to their low cost, mechanical robustness and easy fabrication. This thesis presents two complementary studies on plastic scintillator synthesis: optimization of fluor composition and concentration, and investigation of polymerization conditions through characterization of optical properties. All samples were produced by thermal polymerization. To study the fluor loading, three different samples(CR-1, CR-2 and CR-3) were synthesized and characterized through their transmission spectra, emission distributions and light yields. Their optical properties are found to be comparable to a high-light-yield EJ-204 reference sample. The effects of polymerization initiators were investigated by synthesizing five different samples. The samples were produced using two commonly employed polymerization initiators, 2,2-Azobis(2-methylpropionitrile)~(AIBN) and benzoyl peroxide~(BPO) at concentrations of 0.2%, 0.5%, 1.0%. Light yield was evaluated relative to a control sample prepared without initiator, using four gamma sources and Compton edge analysis. Higher initiator concentrations consistently reduced light output: 0.2\% initiator loading limited the reduction to approximately 8\%, whereas 0.5–1.0% loadings decreased the yield by 20–35%. The results provide practical guidelines to balance fluor composition, concentration and use of polymerization initiator in plastic scintillator synthesis.