Effect of different size of PbWO4 particles on EPDM composite for gamma-ray shielding

2020 ◽  
Vol 34 (07) ◽  
pp. 2050046
Author(s):  
Jinghui Fan ◽  
Juying Wu ◽  
Yan Ma
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Mechanical Test ◽  
Radiation Shielding ◽  
Reinforced Composites ◽  
Sem Images ◽  
Elongation At Break ◽  
Roll Mill ◽  
The Matrix ◽  
Shielding Properties

Ethylene Propylene Diene Monomer (EPDM) composites filled with 0–400 phr [Formula: see text] (PWO) were prepared by conventional process using a two-roll mill. Surface treatment of the fillers coated with KH570 was conducted to enhance the wettability and lubrication of fillers in the polymer matrix. According to SEM images and mechanical test, both micro- and submicro-fillers disperse homogeneously in the matrix, and adhesion of submicro-fillers to the matrix is stronger than that of micro-fillers. The submicro-PWO composites had better tensile strength and elongation at break than those composites containing micro-PWO powder, but a relatively higher hardness. The photon shielding test was performed to determine the radiation shielding properties of these composites, which showed that attenuation of gamma-rays for the submicro-PWO composites was substantially enhanced compared to micro-PWO reinforced composites.

BaSO4/Polyvinyl Alcohol Composites for Radiation Shielding

2015 ◽  
Vol 804 ◽  
pp. 3-6 ◽  
Author(s):  
Voranuch Thongpool ◽  
Akapong Phunpueok ◽  
Naris Barnthip ◽  
Sarawut Jaiyen
Keyword(s):  
Polyvinyl Alcohol ◽  
Optical Density ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Radioactive Source ◽  
Radiation Shielding ◽  
Specimen Thickness ◽  
Attenuation Coefficients ◽  
X Ray ◽  
Shielding Properties

The gamma ray and X-ray shielding properties of PVA containing different proportions of BaSO4 as an aggregate have been investigated. The photon linear attenuation coefficients were measured by using 241Am radioactive source (59.54 keV). Gamma rays were counted by a NaI(Tl) detector. It was found that the shielding efficiency increased when increasing the amount of BaSO4 and specimen thickness. The linear attenuation coefficients were 0.085, 0.125, 0.179, and 0.189 for 0.2, 0.4, 0.6, and 0.8%w/v of BaSO4. The X-ray attenuation test was performed using the diagnostic X-ray machine for energy of 45 kVp. The optical density of X-ray films was investigated. The results showed that the optical density of X-ray film decreased when increasing the amounts of BaSO4.

scholarly journals Preparation and Assessment of Nanocomposites Based on Natural Rubber Latex Reinforced With Multiwall Carbon Nanotubes for Gamma Rays Shielding Applications

2021 ◽  
Author(s):  
A. Abdeldaym ◽  
M. A. Elhady
Keyword(s):  
Carbon Nanotubes ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Multiwall Carbon Nanotubes ◽  
Radiation Shielding ◽  
Nanocomposite Films ◽  
Rubber Matrix ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Shielding Properties

Abstract Reinforcement of the flexible shielding properties of natural rubber (NRL) was achieved through various content Multi-walled carbon nanotubes (MWCNTs) prepared from a simple solution using mixing method. Thereafter, a host of evaluative tests, using different techniques were carried to check the structural, morphological, mechanical and electrical conformity of the MWCNTs in the natural rubber matrix. More notably, the results from the x-ray diffraction (XRD), Scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) revealed that the nanocomposites have been successfully prepared, making them fitting to impact significant improvement on the mechanical strength of the matrix. The evaluation of the formation of MWCNT networks in the matrix, which gives insight into the nanocomposites' electrical conductivity, also showed agreeable results as the linear attenuation coefficients (l) and half-value thickness (HVT) for NRL/MWCNTs nanocomposite films were investigated . Thus, from the foregoing series of results, it can be concluded that nanocomposite films offer promising radiation-shielding properties.

scholarly journals Impact of Modifier Oxides on Mechanical and Radiation Shielding Properties of B2O3-SrO-TeO2-RO Glasses (Where RO = TiO2, ZnO, BaO, and PbO)

2021 ◽  
Vol 11 (22) ◽  
pp. 10904
Author(s):  
M. I. Sayyed ◽  
M. Kh. Hamad ◽  
Mohammad Hasan Abu Mhareb ◽  
K. A. Naseer ◽  
K. A. Mahmoud ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Radiation Shielding ◽  
Transmission Factor ◽  
Attenuation Coefficients ◽  
Radiation Attenuation ◽  
Cross Linkage ◽  
Packed Structure ◽  
Shielding Properties ◽  
Hardness Values

The influence of modifier oxides (TiO2, ZnO, BaO, and PbO) on the mechanical and radiation shielding properties of boro-tellurate glasses is investigated. Samples with a composition of B2O3-SrO-TeO2-RO (RO represents the modifier oxides) were fabricated using the melt quench method, and their physical, mechanical, and radiation attenuation parameters were reported. For this aim, Monte Carlo simulation was employed to predict the radiation attenuation parameters, while the Makishima-Mackenzie model was adopted to determine the mechanical properties. The tightly packed structure with better cross-linkage density is possessed by the Ti-containing glass (SBT-Ti) system among the titled glass batch. The higher Poisson and micro-hardness values of the SBT-Ti glass indicate its structure’s reduced free volume and better compactness. For the glass with PbO, the linear and mass attenuation coefficients are highly increased compared to those glasses doped with TiO2, ZnO, and BaO. The thinner half-value layer was reported at 0.015 MeV, taking values 0.006, 0.005, 0.004, and 0.002 for samples with TiO2, ZnO, BaO, and PbO, respectively. SBT-Pb sample (with PbO) has a thinner HVL compared to other fabricated glass samples. The fabricated glasses’ thickness (Deq) equivalent to 1 cm of lead (Pb) was reported. The results demonstrated that Deq is high at low energy and equals 11.62, 8.81, 7.61, 4.56 cm for SBT-Ti, SBT-Zn, SBT-Ba, and SBT-Pb glass samples, respectively. According to the Deq results, the fabricated glasses have a shielding capacity between 30 and 43% compared to the pure Pb at gamma-ray energy of 1.5 MeV. At high energy (8 MeV), the transmission factor values for a thickness of 1 cm of the fabricated samples reach 88.68, 87.83, 85.95, and 83.11% for glasses SBT-Ti, SBT-Zn, SBT-Ba, and SBT-Pb, respectively.

scholarly journals Mechanical and Shielding Properties of Concrete Subject to Gamma-ray

2020 ◽  
Vol 9 (1) ◽  
pp. 42-49 ◽  
Author(s):  
S. Hosein Ghasemzadeh Mosavinejad ◽  
Samira Kazemi Rad
Keyword(s):  
Tensile Strength ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Pulse Wave ◽  
Graphite Powder ◽  
Ultrasonic Pulse ◽  
Protective Material ◽  
Attenuation Coefficients ◽  
Protective Properties ◽  
Shielding Properties

 In this research, concrete with different percentages of 0, 10, 25, 50, 75 and 100 of barite powder and 10% of graphite powder were investigated for the study of gamma protective properties. The transmitted fluxes of gamma-rays that were emitted from Cs-137 source were detected by a NaI(Tl) detector and analyzed by an MCA analyzer. Then, the samples were tested for compressive strength, tensile strength, ultrasonic pulse wave velocity and the linear attenuation coefficients. By comparing the obtained samples, it was observed that a sample containing 10% barite powder plus 10% graphite powder could be used as a protective material against gamma rays.

scholarly journals Optimizing the shielding properties of strength-enhanced concrete containing marble

2020 ◽  
Vol 12 ◽  
pp. 120005
Author(s):  
Ahmed ABDEL-LATIF ◽  
Maged Kassab ◽  
M. I. Sayyed ◽  
H. O. Tekin
Keyword(s):  
Compressive Strength ◽  
Gamma Ray ◽  
Low Cost ◽  
Effective Atomic Number ◽  
Neutron Radiation ◽  
Mean Free Path ◽  
Strength Properties ◽  
Radiation Shielding ◽  
Removal Cross Section ◽  
Shielding Properties

The purpose of this study is to develop a low cost, locally produced concrete mixture with optimum marble content. The resulting mixture would have enhanced strength properties compared to the non-marble reference concrete, and improved radiation shielding properties. To accomplish these goals five concrete mixtures were prepared, containing 0, 5, 10, 15, and 20% marble waste powder as a cement replacement on the basis of weight.These samples were subjected to a compressive strength test. The shielding parameters such as mass attenuation coefficients μm, mean free path MFP, effective atomic number $Z_{eff}$ and exposure build-up factors EBF were measured, and results were compared with those obtained using the WinXcom program and MCNPX code in the photon energy range of 0.015 - 3 MeV. Moreover, the macroscopic fast neutron removal cross-section (neutron attenuation coefficient) was calculated and the results presented. The results show that the sample which contains 10% marble has the highest compressive strength and potentiallygood gamma ray and neutron radiation shielding properties.

Comparative Study of Calculation Methods for Shield Thickness of Typical Materials against Gamma Rays

2019 ◽  
Vol 960 ◽  
pp. 214-218
Author(s):  
Ying Hong Zuo ◽  
Jin Hui Zhu ◽  
Ying Long Tao ◽  
Sheng Li Niu
Keyword(s):  
Comparative Study ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Attenuation Factor ◽  
Relative Magnitude ◽  
Calculation Methods ◽  
Lead Shield ◽  
Shielding Properties

The paper aims to analyze the shielding properties of concrete and lead materials against gamma rays at different energies, and the relationships between the shield thickness of the two materials and gamma ray energy and attenuation factor have been obtained by using the method of attenuation multiple and the method of half-value-thickness, respectively. The results show that when the gamma ray energy and the attenuation factor are determined, the thickness of the concrete shield layer obtained by the method of attenuation multiple is greater than that obtained by the half-value-thickness method. The relative magnitude of thickness of lead shield obtained by the method of attenuation multiple and the method of half-value-thickness method is relate to the gamma ray energy. When the gamma ray energy is lower than 8 MeV, the thickness of lead shield calculated by the method of attenuation multiple is larger than that obtained by the half-value-thickness method, while when the gamma ray energy is higher than 8 MeV, the conclusion is opposite.

Physical and Gamma-Ray Shielding Properties of Strontium Borosilicate Glasses

2014 ◽  
Vol 979 ◽  
pp. 236-239 ◽  
Author(s):  
Suparat Tuscharoen ◽  
Jakrapong Kaewkhao
Keyword(s):  
Gamma Ray ◽  
Theoretical Calculations ◽  
Computer Software ◽  
Radiation Shielding ◽  
Borosilicate Glasses ◽  
Melt Quenching ◽  
Attenuation Coefficients ◽  
Density Measurements ◽  
Shielding Properties ◽  
Reported Data

Glasses composition of xSrO:(70–x)B2O3:30SiO2when 25≤x≤50 mol% were prepared using the melt quenching technique and investigated the other properties of glasses. The density of the glasses was measured using Archimedes’ principle; the molar volume of the glasses has been derived from density measurements data. The hardness of glasses sample was measured by using the Vickers hardness. Mass attenuation coefficients have been determined experimentally for the glass system at photon energy 662 keV, the results compared with theoretical calculations from WinXCom computer software. The reported data should be useful for decision chosen of these glasses in radiation shielding.

Physical-radiation shielding properties of concrete contains colemanite and ulexite

2020 ◽  
pp. 1420326X2096797
Author(s):  
Nazım Uçar ◽  
Adnan Çalık ◽  
Muhammet Emre ◽  
Iskender Akkurt
Keyword(s):  
Elastic Modulus ◽  
Flexural Strength ◽  
Gamma Rays ◽  
Construction Material ◽  
Radiation Shielding ◽  
Ordinary Concrete ◽  
Important Phenomenon ◽  
Shielding Properties

Radiation is an important phenomenon as it is used in a variety of different fields. However, its possible hazardous effect should be taken into account and it should be shielded. As the concrete is a widely used construction material, the mechanical and radiation shielding properties of concretes containing boron-bearing aggregate additives have been studied. The results show that the addition of colemanite or ulexite into concrete has significant effects on density, workability, compressive and flexural strength, elastic modulus and radiation shielding. The results also show that concrete containing colemanite or ulexite is no more effective in the attenuation of gamma rays than ordinary concrete.

Sign in / Sign up

Export Citation Format

Share Document