Yazar "Rammah, Y. S." seçeneğine göre listele

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    Assessment of gamma-ray attenuation features for La+3 co-doped zinc borotellurite glasses
    (Pergamon-Elsevier Science Ltd, 2020) Rammah, Y. S.; Ozpolat, O. F.; Alim, B.; Sakar, E.; El-Mallawany, R.; El-Agawany, F., I
    In this study, gamma ray and neutrons shielding features were evaluated for La+3 co-doped zinc borotellurite glasses with chemical formula {[(TeO2)(0.70)(B2O3)(0.30)](0.7)(ZnO)(0.30)}(1-x)(La2O3)(x): 0.01< x <= 0.05 mol%. Firstly, the mass and linear attenuation coefficients (MAC, LAC) for glasses were calculated via Photon Shielding and Dosimetry (PSD) software (Phy-X/PSD) in the energy range of 0.015-15 MeV. Depending on MAC and LAC, effective shielding parameters: Half value layer and mean free path (HVL, MFP), effective electron density, atomic number, and conductivity (N-eff, Z(eff), C-eff), exposure and energy absorption buildup factors (EBF, EABF) have been evaluated. In addition, effective fast neutron removal cross section (FNRCS) for the studied glasses have been calculated. The obtained data were compared with those of some commercial glasses and concrete. Results reveal that HVL for all samples can be arranged in the order TBZL1 TBZL2 > TBZL3 > TBZL4 > TBZL5. The HVL, TVL and MFP values of TBZL5 glass are 2.988 cm, 9.927 cm, and 4.311 cm, respectively. TBZL5 glass has the highest C-eff values and TBZL1 glass has the lowest Ceff values. EBF values change range from 1 to 4 at 1 MFP and from 1-10(10) at 40 MFP value. Therefore, it can be amonyg the alternative materials that can be preferred in radiation application areas.
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    Evaluation of.-rays and neutron shielding parameters of high dense bismo-boro-tellurite glasses: Comparative study
    (Pergamon-Elsevier Science Ltd, 2022) Sakar, E.; Ozpolat, O. F.; Alim, B.; Alsaif, Norah A. M.; Rammah, Y. S.
    The main high energy radiation-matter interaction parameters of the 30B(2)O(3)-(70-x)TeO2-xBi(2)O(3), where x = 40, 50, 60 and 70 mol% (BTB) glasses have been studied in the wide energy range. The theoretical calculations were made for some special X and gamma-ray energies emitted from Fe (55), Am (241), Cs (137) and Co (60) radioactive sources for photon energies in the range of 15 keV - 15 MeV. All evaluated radiation shielding parameters were compared with some selected concretes (Ordinary concrete (OC), Hematite-Serpenite (HS) and Basalt-Magnetide (BM)), and glasses (Te and Pb based). The BTB-glasses have higher mass attenuation coefficient (MAC) values than other glasses (Te and Pb based) and concretes (OC, HS, and BM). The half value layer (HVL) of the investigated BTB-glasses has the following trend: OC > HS > BM > Te-Glass > Pb-glass > BTB40 > BTB50 > BTB60 > BTB70. In terms of mean free path (MFP), the BTB70 coded glass has the lowest MFP values due to the highest Bi2O3 content. In terms of the Z(eff) values of BTB coded glasses vary between 70 and 75 at the lowest energy level. The effective atomic number (Z(eff)) values in this energy region were 48.974 and 63.102 for Te and Pb glasses, respectively, and 13,339, 15.520 and 15.894 for OC, HS and BM concretes. The BTB-coded glasses have lower exposure buildup factor (EBF) than all other glass and concrete up to 3 MeV photon energies. The energy absorption buildup factor (EABF) values range from 1 to 4.2 for all samples at 1 MFP and at 40 MFP values, it reaches 10(8) for BTB coded glasses and 10(10) for Te-based glass. Results confirmed that BTB-glasses, especially BTB70 glass sample can be used in applications requiring radiation safety.