Enhancement and optimization of gamma radiation shielding by doped nano HgO into nanoscale bentonite

Allam, Elhassan A.; El‐Sharkawy, Rehab M.; El-Taher, Atef; Shaaban, E.R.; Elsaman, Reda; Massoud, Ehab El Sayed; Mahmoud, Mohamed E.

doi:10.1016/j.net.2021.12.026

Cited by 19 publications

(8 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The half value layer (HVL) and mean free path (MFP) values are also important parameters to describe the γ-ray shielding performance of composites. , Normally, the smaller the value of these two parameters, the better its radiation shielding performance because the radiation will be shielded through a thinner area, which is extremely efficient. Table shows the MFP and HVL values of composite samples at 105.3 and 86.5 keV of γ-ray.…”

Section: Resultsmentioning

confidence: 99%

Flexible and Mechanically Enhanced Polyurethane Composite for γ-ray Shielding and Thermal Regulation

Cai

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Microencapsulation of paraffin with lead tungstate shell (Pn@PWO) shows the drawbacks of low wettability and poor leakage-proof property and thermal reliability, restricting the application of phase change microcapsules. Herein, a novel paraffin@lead tungstate@silicon dioxide double-shelled microcapsule (Pn@PWO@SiO 2 ) has been successfully constructed by the emulsion-templated interfacial polycondensation and applied in the waterborne polyurethane (WPU). The results indicated that a SiO 2 layer with controlled thickness was formed on the PbWO 4 shell. The Pn@PWO@SiO 2 microcapsules have exhibited superior leakage-proof properties and thermal reliability through doubleshelled protection, and the leakage rate decreased by at least 54.11% compared to that of Pn@PWO microcapsules. The SiO 2 layer with abundant polar groups ameliorated the wettability of microcapsules and the interfacial compatibility between microcapsules and the WPU matrix. The tensile strength of WPU/Pn@ PWO@SiO 2 -2 composites reached 10.98 MPa, which was over 7 times greater than that of WPU/Pn@PWO composites. In addition, WPU/Pn@PWO@SiO 2 -2 composites with a latent heat capacity of over 41 J/g exhibited efficient phase change stability and γ-ray shielding properties. Also, the mass attenuation coefficients reached 1.38 cm 2 /g at 105.3 keV and 1.12 cm 2 /g at 86.5 keV, respectively. These properties will greatly promote the application of WPU/Pn@PWO@SiO 2 composites into γ-ray-shielding devices with thermal regulation.

show abstract

Section: Resultsmentioning

confidence: 99%

Flexible and Mechanically Enhanced Polyurethane Composite for γ-ray Shielding and Thermal Regulation

Cai

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Several investigations have been undertaken to introduce better γ-ray shielding materials [21][22][23][24][25][26]. Some of these investigations concentrated on composite materials using various matrices such as polymers, glasses, clays, epoxy resin, rubber, etc In contrast, the filler materials were based on metal or metal oxides to combine different properties of these components in a single composite to produce new lightweight composites with cost-efficient ingredients [27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…One of these materials, clay, is more frequently used for heavy-duty buildings than many others [35] and is utilized in building and construction worldwide. The potential for using natural clays and minerals as radiation shielding has been thoroughly investigated by several researchers [33,34,[36][37][38]. One of the naturally occurring clays is called attapulgite (ATP, also known as palygorskite).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of shielding properties of a developed nanocomposite from intercalated attapulgite clay by Cd/Pb oxides nanoparticles

Negm,

El-Sharkawy,

Abdeltwab

et al. 2024

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

The study investigated new nanocomposites' γ-ray and neutron shielding properties based on raw attapulgite, a clay matrix intercalated with different weight percentages of mixed nanometal oxides CdO and PbO. The various percentages were as follows: (100-2x)%Attapulgite + x%CdO + x%PbO, abbreviated as (AT100-2xCdxPbx), where x= 5, 10, 15%. The nanocomposites were characterized using XRD, FTIR, and EDX, confirming their successful preparation. SEM images revealed that the mixed oxide nanoparticles were successfully intercalated into the layers of attapulgite clay, with an average particle size of approximately 31.46 nm. The bulk densities of the prepared nanocomposites were measured to be in the range of 2.0342 to 2.5550 g/cm3. GEANT4 simulations were employed to evaluate the nanocomposites' γ-ray and neutron shielding performance in the photon energy range of 0.015 to 15 MeV. Phys-X code was used for verification. The simulation results showed a maximum difference of approximately 9.5% between GEANT4 and Phys-X predictions. To assess the γ-ray shielding performance, various shielding parameters were calculated at selected photon energies. The µm values ranged from 4.589 to 0.020 cm2.g-1, 6.311 to 0.021 cm2.g-1, 8.350 to 0.022 cm2.g-1 and 10.804 to 0.023 cm2.g-1 for raw attapulgite, AT90Pb5Cd5, AT80Pb10Cd10, AT70Pb15Cd15 across the photon energy range. The AT70Pb15Cd15 nanocomposite exhibited the highest µm, Zeff, Zeq, and the lowest T1/2, T1/10, and MFP values. Notably, it also demonstrated the highest FNRCS (approximately 0.1 cm-1). These findings suggest that clay-based nanocomposites represent a new class of low-cost, locally available advanced materials with potential applications in γ-ray and neutron shielding characteristics.

show abstract

“…Bentonite is a good candidate for radiation shielding due to its desirable thermal features like good thermo-chemical stability and high corrosion resistance. In addition to bentonite being abundant around the world, these properties make it a great candidate for radiation shielding purposes [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Previous research has evaluated the shielding capability of natural bentonite and has found desirable results after some clay processing [5][6][7][8]. Furthermore, researchers have enhanced bentonite materials using cement, finding that the inclusion of concrete led to improvements in the shielding capability of the materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Gamma-ray Shielding Performance of Calcinated and Ball-Milled Calcinated Bentonite Clay Nanoparticles

et al. 2022

View full text Add to dashboard Cite

The current investigation deals with the fabrication of two various composite-based bentonite clay minerals. The characterization and radiation shielding parameters for the two fabricated composites (calcinated and ball-milled calcinated bentonite) were studied. X-ray diffraction was utilized to illustrate the crystalline phase of the fabricated composites. Furthermore, Williamson and Hall’s method was used to determine the grain size of both the calcinated and ball-milled calcinated composites. The particle size, according to the calculation was 39.84 nm, and the strain was 0.216 for the calcinated bentonite, while the particle size of the ball-milled bentonite was 26.96 nm, and the strain was 0.219. In comparison, the transmission electron microscope (TEM) showed that the grain size of the calcinated bentonite was 566.59 nm, and it was 296.21 nm for the ball-milled calcinated bentonite. The density of the fabricated composites varied between 1.60 and 186 g/cm3 for the calcinated bentonite and between 1.83 and 2.075 g/cm3 for the ball-milled calcinated bentonite. Moreover, the radiation shielding capacity of the composites was analyzed. The results show that the gamma-ray attenuation capacity of ball-milled calcinated bentonite is high compared to ordinary calcinated bentonite. These results confirm the effect of particle grain size on optimizing the gamma-ray shielding capacity of the fabricated materials.

show abstract

Enhancement and optimization of gamma radiation shielding by doped nano HgO into nanoscale bentonite

Cited by 19 publications

References 31 publications

Flexible and Mechanically Enhanced Polyurethane Composite for γ-ray Shielding and Thermal Regulation

Flexible and Mechanically Enhanced Polyurethane Composite for γ-ray Shielding and Thermal Regulation

Evaluation of shielding properties of a developed nanocomposite from intercalated attapulgite clay by Cd/Pb oxides nanoparticles

Characterization and Gamma-ray Shielding Performance of Calcinated and Ball-Milled Calcinated Bentonite Clay Nanoparticles

Contact Info

Product

Resources

About