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    Production of barite-doped yarns and testing their usability for ionizing and electromagnetic radiation shielding
    (Elsevier Ltd, 2022) Akman, F.; Ozkan, I.; Ozel, F.; Aydemir, H.; Kaçal, M.R.; Agar, O.
    Barite-doped and polypropylene-based masterbatches were produced at different ratios, and 1 × 1 Rib type weaving process was carried out by obtaining filament yarns. While the morphological and structural properties of the obtained textile products were investigated with XRD, FTIR and SEM, thermal stabilities were investigated with TGA. Then, the shielding abilities of the products against ionizing and electromagnetic radiation were analyzed. The shielding properties against ionizing radiation were studied with mass attenuation coefficient, half value layer, effective atomic number and radiation protection efficiency parameters at nine different energies in the energy range of 17.75 to 81.0 keV. The shielding properties against electromagnetic radiation were studied in the range of 15 to 40 GHz. To test the usability of the products, antibacterial activity tests, breaking strength and elongation tests and surface resistivity tests were carried out. It has been observed that all products are suitable in terms of usability and also, ionizing and electromagnetic radiation shielding properties increase with increasing barite content, and the product containing 10% barite is a good shielding material for radiation compared to others. The data of the present survey can be quite helpful for possible applications such as aerospace, medicine, science, nuclear industry. © 2022 Elsevier Ltd
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    Shielding features, to non-ionizing and ionizing photons, of FeCr-based composites
    (Elsevier Ltd, 2021) Akman, F.; Ozkan, I.; Kaçal, M.R.; Polat, H.; Issa, Shams A.M.; Tekin, H.O.; Agar, O.
    This paper has been focused on the a detail study on non-ionizing and ionizing electromagnetic (EM) shielding features and build-up factors of reinforced with ferrochrome (FeCr) composites. The non-inozing electromagnetic shielding performance quantities of composites have been determined in the frequency range between 12.4 and 18.0 GHz. Also, the experimental mass attenuation coefficients (MAC) have been estimated using gamma spectrometer and various radioactive point, and compared to those of theoretical and simulation (MCNPX) results. With help of the obtained linear attenuation coefficients, several attenuation quantities, i.e., effective atomic number (Zeff), half value layer (HVL), and mean free path (MFP) have been discussed. In addition, buildup factors (EBF and EABF) values have been estimated utilizing the G-P fitting method. The results showed that composite encoded FeCr(15%) is superior shielding attenuation properties among the investigated samples. © 2020 Elsevier Ltd
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    Study on gamma radiation attenuation and non-ionizing shielding effectiveness of niobium-reinforced novel polymer composite
    (Korean Nuclear Society, 2022) Akman, Ferdi.; Ogul, H.; Ozkan, I.; Kaçal, M.R.; Agar, O.; Polat, H.; Dilsiz, K.
    Advanced radiation applications have been widely used and extended to many fields. As a result of this fact, choosing an appropriate shielding material based on the radiation application has become vital. In this regard, the integration of elements into polymer composites has been investigated and contributed to the quantity and quality of radiation shielding materials. This study reports photon attenuation parameters and electromagnetic shielding effectiveness of a novel polymer composite prepared with a matrix reinforced with three different proportions (5, 10, and 15 wt%) of niobium content. Addition of Nb dopant improves both photon attenuation and electromagnetic shielding effectiveness for the investigated composites. Therefore, Nb(15%) polymer composite with highest concentration has been found to be the best absorber for ionizing and non-ionizing radiations. Consequently, the performed analyzes provide evidences that the prepared Nb-reinforced polymer composite could be effectively used as photon radiation attenuator and electromagnetic shielding material. © 2021 Korean Nuclear Society