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RISS 인기검색어
- 검색키워드
- 저자 : Rilwan U. (검색결과 4 건)
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Rilwan U.,Aliyu G.M.,Olukotun S.F.,Idris M.M.,Mundi A.A.,Bello S.,Umar I.,El-Taher A.,Mahmoud K.A.,sayyed M.I. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
This research intends to recycle bone and incorporate it into concrete for radiation shielding application using Phy-X/PSD software. Cement, sand and granite were mixed in proportion of 0.5 kg:1 kg:1 kg to obtain sample A. Other concretes composing of cement, sand, granite and bone ash was in proportion 0.45 kg:1 kg:1 kg:0.05 kg, 0.1 kg:1 kg:1 kg:0.4 kg and 0.35 kg:1 kg:1 kg:0.15 kg to obtain samples B, C and D respectively. 0.5 water-tocement (W/C) ratio was adopted throughout the mixes because the control mix contain the normal water quantity for normal hydration of cement. Replacing the bone ash for the cement in the fabricated concretes enhances their densities where the fabricated concretes’ density decreased from 2.33 g/cm3 to 2.22 g/cm3 by raising the reinforcing bones fly ash concentration from 0 to 0.15 kg. Additionally, increasing the bones fly ash concentration within the fabricated concretes increases their linear attenuation coefficient (LAC) where the fabricated concretes’ μ values at 0.662 MeV reach 0.181 cm 1, 0.178 cm 1, 0.174 cm 1, and 0.171 cm 1, respectively for concretes A, B, C, and D. The use of other local materials is recommended, as it improves waste management being the major aim of the sustainable development goal.
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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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Almuqrin Aljawhara H.,Mahmoud K.A.,Rilwan U.,Sayyed M.I. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
The current work aims to fabricate metal oxide-doped (PbO, Fe2O3, MgO, and Al2O3, each of which boasts a purity of 99%) zinc barium borate glasses through the melt quenching technique at the 1000 ◦C melting temperature. The results showed that adding 5 mol.% of metal oxides PbO, Fe2O3, Al2O3, and MgO increases the density of the zinc barium borate glasses. Additionally, the fabricated glasses’ mechanical properties were determined based on the Makishima-Mackenzie model, which proved that the highest mechanical properties were achieved for glasses doped with Al2O3 compounds. The mechanical moduli for the glasses doped with Al2O3 reach 80.95 GPa (Young), 59.90 GPa (bulk), 31.75 GPa (shear), and 102.23 GPa (longitudinal). Additionally, the Al2O3-doped glasses’ microhardness reaches 4.77 GPa. Moreover, estimation of the fabricated glasses’ gammaray shielding capacity utilized Monte Carlo simulation. The highest linear attenuation coefficients are 29.132, 19.906, 19.243, and 18.923 cm 1 obtained at 0.033 MeV for glasses dopped by PbO, Fe2O3, MgO, and Al2O3, respectively. Therefore, glasses doped with 5 mol.% of PbO have high gamma-ray shielding capacities followed by glasses doped by Fe2O3.
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Almuqrin Aljawhara H.,Sayyed M.I.,Kumar Ashok,Rilwan U. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
The amorphous glasses containing PbO, ZnO, MgO, and B2O3 have been fabricated using the melt quenching technique. The structural properties have been analysed using the Fourier-transform infrared (FTIR) and Raman spectroscopy. Derivative of Absorption Spectra Fitting (DASF) method have been used to estimate the band gap energy from the UV–Vis absorption data which decreases from 3.02 eV to 2.66 eV with increasing the concentration of the PbO.The four glass samples 0.284 and 0.826 MeV showed unique variations in terms of gamma attenuation ability. LZMB4 glass sample proved to be the mist effective in terms of shielding of gamma radiation as it requires little distance compared to LZMB3, LZMB2 and LZMB1 to attenuate. RPE revealed a raise with increase in the thickness of the material and reduces as the energy raises. TF is superior in LZMB1 compared to LZMB2, LZMB3 and LZMB4, confirming that, LZMB4 will attenuate better. The ZEff of the materials was seen falling as the energy increases, confirming that the linear attenuation coefficient of the glass materials decreases when the energy is increased. The results confirmed that, glass material LZMB4 is the best option especially for gamma radiation shielding applications compared to LZMB3, followed by LZMB2, then LZMB1
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