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- 검색키워드
- 저자 : M. Elsafi (검색결과 5 건)
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M. Elsafi,Heba jamal ALasali,Aljawhara H. Almuqrin,K.G. Mahmoud,M.I. Sayyed Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6
In the present study, six silicone rubber doped by tellurium borate oxides were fabricated using the casting method. The densities of the fabricated silicon rubber-doped by tellurium borate oxides samples were measured using the Archimedes Method. Moreover, the linear attenuation coefficient of silicone rubber doped tellurium borate oxides samples was evaluated experimentally using the hyper pure germanium, and the recorded linear attenuation coefficient values were affirmed using the theoretical Phy-X program. The experimental measurements were performed using the narrow beam transmission method with radioactive isotopes Am-241, Cs-137, and Co-60 with energies of 59, 661, 1173, and 1332 keV. The linear attenuation coefficient values showed an enhancement by 4.73 times, 1.20 time, 1.17, time, and 1.17 time, respectively at gamma photon energies of 59, 661, 1173, and 1332 keV, when the TeO<sub>2</sub> concentration increased in the fabricated composites from 0 to 50 wt%. The enhancement of the linear attenuation coefficient values has a positive effect on the transmission rate values where the half-value thickness and transmission rate were decreased accompanied by an increase in the RPE.
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Elsafi M.,Sayyed M.I.,Almuqrin Aljawhara H. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
This investigation developed a novel polyester composite based on the addition of zinc oxide (ZnO) of different sizes. We prepared nine samples Containing different percentages and sizes of ZnO as well as the control sample (Pol-ZnO0). The attenuation factors of Pol-micro ZnO were estimated using Phy-x software, while the HPGe detector and various gamma sources were used to experimentally measure the all-prepared composites. In terms of the two methods for micro composites, good agreement was observed. The linear attenuation coefficient (LAC) of Pol-ZnO20, Pol-ZnO40, and Pol-ZnO60, two more samples one with ZnO nanoparticles instead of microparticles, and the other with half microparticles and half nanoparticles (referenced as 0.5 M + 0.5 N) were determined. For all the Polyester composites and energies, the mixture of microparticles and nanoparticles had greater LAC values than each of the particles on their own. For example, the LAC values for the Pol-ZnO20 polymer at 1.330 MeV are 0.0836, 0.0888, and 0.0903 cm 1 for the microparticles, nanoparticles, and mixture, respectively. The values of the prepared polymer samples’ radiation protection efficiency (RPE) against energy with a thickness of 2 cm was determined experimentally. The Pol-ZnO60 0.5 M + 0.5 N sample has the highest RPE out of all the samples, followed by its nanoparticle counterpart, and then its microparticle counterpart. On the other hand, the Pol-ZnO0 sample, the polymer with no ZnO content, at all energies has the lowest RPE, followed by the three Pol-ZnO20 samples.
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Mohanad S. Eid,I.I. Bondouk,Hosam M. Saleh,Khaled M. Omar,M.I. Sayyed,Ahmed M. El-Khatib,Mohamed Elsafi 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.4
The aim of this work is to study the radiation shielding properties of cement samples with waste glassincortated into its composition. The mass attenuation coefficient (MAC) of the samples were experimentally determined to evaluate their radiation shielding ability. The experimental coefficient wasevaluated using NaI detector for gamma energies between 59.53 keV and 1408.01 keV using differentradioactive point sources Am-241, Eu-152, Co-60, and Cs-137, and the gamma transmission parametershalf-value layer, mean free path, and transmission factor were calculated. The theoretical coefficient ofthe composites was determined using Geant4 and XCOM software. The results were also comparedagainst Geant4 and XCOM simulations by calculating the relative deviation between the values todetermine the accuracy of the results. In addition the mechanical properties (including Compressive andporosity) as well as the thermogravimetric analysis were tested for the present samples. Overall, it wasconcluded that the cement sample with 50% waste glass has the greatest shielding potential for radiationshielding applications and is a useful way to reuse waste glass.
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Experimental study of the radiation shielding characteristics of new PbO– Na2O–B2O3–BaO glasses
Sayyed M.I.,Rilwan U.,Mahmoud K.A.,Elsafi Mohamed 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
This work synthesized four glass samples with a fixed ratio of PbO to Na2O and a variable ratio of BaO to B2O3. The linear attenuation coefficient (LAC) (μ, cm 1) and additional attenuator parameters were determined experimentally using a semiconductor detector and different gamma sources. The comparison was carried out between the experimental and the XCOM calculated results, with good agreement emerging between the two results. The impacts of the BaO substituting for the B2O3 on fabricated PNBB glasses’ radiation shielding properties were discussed. By increasing the BaO substitution concentration between 10 and 25 mol.%, the LAC μ values (cm 1) increased by 76.60 %, 13.81 %, 12.56 %, and 12.52 % for the respective γ-ray energies of 0.059, 0.662, 1.173, and 1.332 MeV. The μ value reduction with raised gamma energy values increased the values of the calculated half-value thickness (Δ0.5) as a result of the μ and Δ0.5 values’ reverse proportionality. Other shielding parameters such as the lead equivalent thickness (Δeq) and radiation protection efficiency were also determined for the present PNBB glass samples.
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Thabit Hammam Abdurabu,Ismail Abd Khamim,Sayyed M.I.,Hashim S.,Abdullahi I.,Elsafi Mohamed,Keshavamurthy K.,Jagannath G. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.1
The glass series modified by tungsten oxide was created using the compounds (75-x) B2O3– 10SrCO3– 8TeO2– 7ZnO - xWO3, where x = 0, 1, 5, 10, 22, 27, 34, and 40% mole percentage. A UV–visible spectrophotometer and thermogravimetric-differential thermal analysis (TG-DTA) methods were employed to characterize the specimen’s optical and phase transition attributes, respectively. The mass-attenuation coefficient (AC) of all created glasses from BSTZW0 to BSTZ7 was estimated using Geant4 code from 0.05 to 3 MeV and compared to the XCOM software results, with a relative difference of less than 2% between the two results. The increase of WO3 percentage lead to an increase in the Linear-AC at each studied energy, and this is mainly due to the fact that the higher the percentage of WO3 in the glass increases its density which causes an increase in the Linear-AC, so an energy of 0.06 MeV, as an example, the values of the Linear-AC was 4.009, 4.509, 5.442, 6812, 8.564, 9.856, 10.999 and 11.628 cm 1 form BSTZW0 too BSTZW7, respectively. The Half-VL (value layer), Mean-FP (free path), Tenth-VL, and Radiation attenuation performance (RAP) were also calculated for the current BSTZW-glass samples and revealed that BSTZW7 had the best gamma ray attenuation performance at all discussed energies when compared to other studied glass samples.
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