Browsing by Author "Kara, Umit"

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Optical, Structural and Gamma Ray Shielding Properties of Dolomite Doped Lithium Borate Glasses for Radiation Shielding Applications
(Elsevier, 2020) Kara, Umit; Issa, Shams A. M.; Yorgun, N. Yildiz; Kilicoglu, O.; Rashad, M.; Abuzaid, Mohamed M.; Tekin, H. O.
The elemental analysis of dolomite [CaMg(CO3)] doped glasses encoded DG10, DG20, DG30 and DG40 with different compositions is tested using Energy Dispersive X-ray (EDX) technique. Next, the surface morphology of fabricated glasses was investigated with scanning electron microscopy (SEM). On the other hand, the optical properties of fabricated the Dolomite additive were evaluated along the wavelength ranged from 300 to 900 nm. At last, nuclear radiation shielding properties of dolomite glasses were determined for gamma-rays. It is observed from the optical absorption spectra that the surface becomes smooth with no agglomerations with Dolomite%30 and %40. In addition, the results showed that Dolomite additive improves the gamma protecting capacity of lithium borate glasses. As a result, it can be referred that a glass sample with the highest Dolomite additive encoded DG40 has better shielding efficiency in terms of radiation shielding.
Optical, Structural and Nuclear Radiation Shielding Properties of Li2b4o7 Glasses: Effect of Boron Mineral Additive
(Springer Heidelberg, 2020) Kara, Umit; Kavaz, E.; Issa, Shams A. M.; Rashad, M.; Susoy, G.; Mostafa, A. M. A.; Tekin, H. O.
The glass samples with Li2B4O7 (100 - x) Tincalx (x = 0, 10, 20, 30 and 40 wt%) composition were synthesized by melt-quenching technique (Tincal = Na2B4O7 center dot 10H(2)O). The elemental analysis of Tincal with different compositions is tested using energy-dispersive X-ray technique. Moreover, the surface morphology of fabricated glasses was investigated with scanning electron microscopy. Further, optical properties of fabricated Tincal glasses were evaluated along the wavelength ranged from 200 to 900 nm. Finally, nuclear radiation shielding properties of Tincal glasses were determined for gamma rays, neutrons and charged particles. It is observed from the optical absorption spectra that Tincal 20% and 40% indicated good optical transparency in the visible range of light (400-700 nm). The results showed that Tincal additive improves the gamma protecting capacity of glasses. It was also noticed that the addition of Tincal was also enhanced the neutron absorption of the glasses by increasing the cross section of the neutron and reducing the coherent scattering length.
Synergistic Effect of Serpentine Mineral on Li2b4o7 Glasses: Optical, Structural and Nuclear Radiation Shielding Properties
(Springer Heidelberg, 2020) Kara, Umit; Issa, Shams A. M.; Susoy, G.; Rashad, M.; Kavaz, E.; Yorgun, N. Yildiz; Tekin, H. O.
The hypothesis of the present investigation underlined with determination of possible synergistic effects of serpentine mineral additive on Li2B4O7 glasses. A group of Li2B4O7 glasses with serpentine mineral additive were synthesized by melt-quenching technique. The elemental analysis of two different Li2B4O7 glasses with different amount of serpentine additive is tested using energy-dispersive X-ray (EDX) technique. Next, the surface morphology of synthesized serpentine glasses was investigated with scanning electron microscopy (SEM). The optical features of synthesized serpentine glasses were determined along the wavelength ranged from 200 to 900 nm. Lastly, nuclear radiation shielding properties of Li2B4O7 glasses with serpentine mineral additive were determined for gamma rays, neutrons and charged particles. MCNPX (version 2.6.0) general-purpose Monte Carlo code has been utilized for mass attenuation coefficients calculations. The results showed that the spectra are decreasing with wavelength with an observed peak centered at 450 nm. Moreover, it is observed that serpentine mineral additive improves the gamma protecting capacity of Li2B4O7 glasses. It was also noticed that the addition of serpentine mineral also enhanced the neutron and charged particle absorption of the glasses.