Investigating the effect of hematite additive on the performance of clay barriers for radioactive waste disposals

Salati, Abbas; Isfahani, Hajar Share; Roshanzamir, Mohammad Ali; Azhari, Amin

doi:10.1007/s10064-022-02914-6

Cited by 4 publications

(3 citation statements)

References 47 publications

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“…(cm −1 ), MFP (cm), and HVL (cm) of the barite sample are better than those of the hematite sample by about 9.17%. The higher density (4.20 g/cm 3 ) and compacted morphology of it (Figure 8a) compared to those of the hematite sample (i.e., lower density, 2.90 g/cm 3 and less compacted morphology) account for the superiority of the barite sample in neutron attenuation. This can be attributed to the fact that the higher density and lower porosity of material allow for more potency in the inelastic and elastic collisions to slow down the fast neutrons [25].…”

Section: Geochemical Characterizationmentioning

confidence: 98%

“…The physical tests of the studied samples (Table 2) demonstrate that the barite sample has a higher density (4.2 g/cm 3 ) than the hematite one has (2.9 g/cm 3 ). This can be assigned to the higher compactness of the particles in the barite structure than those in the hematite one, as was mentioned before and is illustrated by the SEM images (Figure 8).…”

Section: Physical and Mechanical Characterizationmentioning

confidence: 99%

“…Applied mineralogy is one of the essential branches of geology which investigates the use of minerals in radiation attenuation applications. One of these applications is the use of minerals as barriers to attenuate the radiation or restrain the radioactive waste resulting from nuclear reactors or radiotherapy centers [2,3]. Such radioactive waste is associated with the dual problems of disposal and health hazards due to the release of ionizing radiation, including neutrons, and γ-rays [4].…”

Section: Introductionmentioning

confidence: 99%

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Deep Insights into the Radiation Shielding Features of Heavy Minerals in Their Native Status: Implications for Their Physical, Mineralogical, Geochemical, and Morphological Properties

et al. 2022

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Barite and hematite are the most common heavy-weight minerals applied as aggregates in radiation shielding concrete (RSC). Therefore, to limit the cement consumption and reduce the CO2 emissions its production, the aim of this study is to use Egyptian barite and hematite minerals in their native status and evaluate their attenuation efficiency against fast neutrons and γ-rays. This was implemented through the measurement of their radiation attenuation against fast neutrons and γ-rays in the energy ranges of 0.80–11 and 0.40–8.30 MeV, respectively, employing a Pu-Be source and a stilbene scintillator. Theoretical calculations were prepared using the NXcom program to validate the fast neutron attenuation measurements. Furthermore, the implications of the physical, mineralogical, geochemical, and morphological characteristics of these heavy-weight minerals with respect to their attenuation efficiencies were considered. We found that barite has superior radiation attenuation efficiency for fast neutrons and γ-rays compared to hematite by 9.17 and 51% for fast neutrons and γ-rays, respectively. This was ascribed to the superior physical, mineralogical, geochemical, and morphological properties of the former relative to those of the latter. Furthermore, a satisfactory agreement between the experimental and theoretical results was achieved, with a deviation of 16 and 19.25% for the barite and hematite samples, respectively. Eventually, barite and hematite can be successful candidates for their use as sustainable alternatives to common RSC.

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Section: Geochemical Characterizationmentioning

confidence: 98%

Section: Physical and Mechanical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deep Insights into the Radiation Shielding Features of Heavy Minerals in Their Native Status: Implications for Their Physical, Mineralogical, Geochemical, and Morphological Properties

et al. 2022

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Dispersion, viscosity, unconfined compression and bender element testing of bentonite-waste glass mixtures

Demir

Çabalar

2023

European Journal of Environmental and Civil Engineering

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Evaluating the performance of red mud and hematite powder additives of clay layer used in low-level radiation waste landfills

Salati

Isfahani

Rowshanzamir

et al. 2023

Preprint

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Clay is used as the main material for the construction of landfill liners due to its unique properties such as low hydraulic permeability, self-healing performance, and availability. In addition to these properties, radiation shielding performance is a vital challenge for low-level radioactive waste disposal. In this study, the effect of two additives, including red mud and hematite are investigated on the radiation shielding and hydromechanical performance of bentonite clay. Experimental tests were performed on mixtures with 15, 30, and 45 percent of additives, and the shielding performance, hydraulic permeability, and mechanical strength have been investigated. Energy scattering (EDS) and scanning electron microscopy (SEM) tests have been performed to chemically analyze the mixture components and to define the linear attenuation coefficient by implementing simulation (MCNP code) and theoretical (XCOM database) methods. The results showed a good agreement between the experimental, simulation, and theoretical approaches. The best linear attenuation coefficient performance was reached by adding 15 percent of each additive while maintaining the hydraulic permeability and uniaxial strength in the acceptable range.

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Investigating the effect of hematite additive on the performance of clay barriers for radioactive waste disposals

Cited by 4 publications

References 47 publications

Deep Insights into the Radiation Shielding Features of Heavy Minerals in Their Native Status: Implications for Their Physical, Mineralogical, Geochemical, and Morphological Properties

Deep Insights into the Radiation Shielding Features of Heavy Minerals in Their Native Status: Implications for Their Physical, Mineralogical, Geochemical, and Morphological Properties

Dispersion, viscosity, unconfined compression and bender element testing of bentonite-waste glass mixtures

Evaluating the performance of red mud and hematite powder additives of clay layer used in low-level radiation waste landfills

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