Attenuation Parameters and Effective Atomic Numbers of Concretes Containing Pumice for Some Photon Energies by Experiment, Simulation and Calculation

Akyıldırım, Hakan

doi:10.31590/ejosat.454777

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…For all shields A to G, the attenuation reduction showed no intrinsic differences between the studied samples at 661.7 keV; becoming close, independent of the energy. The μ values varied highly according to the absorption and scattering mechanism of the X-rays; this variation depends strongly on the incoming photon energy and Z of the material [ 17 ]. Therefore, the attenuation efficiency for the shields with fillers was evident compared to the pure EVA in the lower energy region, where the predominant mechanism is photoelectric absorption [ 17 , 18 ].…”

Section: Discussionmentioning

confidence: 99%

Development of New Lead-Free Composite Materials as Potential Radiation Shields

et al. 2021

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Utilizing a polymer-based radiation shield offers lightweight, low cost, non-toxic compared to lead and solution for eliminating generated secondary neutrons. Incorporating silicon (i.e., one of the most abundant elements) in new applications, such as shielding, would have an impact on the economy and industry. In this study, seven potential shielding materials, composed of silicon, silicon carbide, and boron carbide embedded ethylene vinyl acetate (EVA) copolymers, are proposed. The shielding performance of these composite materials, including the attenuation coefficients (µ), the mass attenuation coefficients (µm), the half value layer (HVL), the mean free path (MFP), and the radiation protection efficiency (RPE) were examined using photon beams. Measured µm were verified against the calculated values. The averaged agreement was within ±7.4% between the experimental measurements and the theoretical calculation results. The HVL and MFP measured values for the polymer composites were lower than that for the pure EVA polymer, indicating the fillers in the polymers enhanced the shielding performance. The EVA + SiC (30%) and EVA + Si (15%) + B4C (15%) composites required the lowest thickness to stop 50% of the incident photons. The evaluation of experimental results of the RPE revealed that the polymer composites containing SiC (30%), Si (15%) + B4C (15%), or SiC (15%) + B4C (15%) succeeded in blocking 90–91% of X-rays at nearly 80 keV. However, a thicker shield of the proposed composite materials or combined layers with other high-Z materials could be used for higher energies.

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Section: Discussionmentioning

confidence: 99%

Development of New Lead-Free Composite Materials as Potential Radiation Shields

et al. 2021

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Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

et al. 2021

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The current study aims to report the gamma ray-neutron attenuation parameters of eight types of vinyl ester pumice (V-P) composites for wide energy ranges of 511-2140 keV via MCNPX and FLUKA codes. The radiation shielding properties of these composites were presented graphically and are discussed in detail in this study. From the obtained results, it can be concluded that the MCNPX and FLUKA outcomes are in agreement with each other, and also the FLUKA code can be used as an alternative technique to determine the attenuation features of vinyl ester composites. Besides, the linear attenuation coefficient and total macroscopic cross sections' ( P t ) dependencies on the density and also mass attenuation coefficient were found for all selected samples. To sum up, findings show that composite coded as V-P50 can be a good competitive candidate in terms of gamma rays and neutron shielding.

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