Assessment study for multi-barrier system used in radioactive borate waste isolation based on Monte Carlo simulations

Bayoumi, T.A.; Reda, Sonia M.; Saleh, Hosam M.

doi:10.1016/j.apradiso.2011.09.016

Cited by 36 publications

(6 citation statements)

References 10 publications

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“…Irradiation was approved in the Cobalt-60 gamma cell source (made in Russia) installed at the National Centre for Radiation Research and Technology, Cairo, Egypt (dose rate 1.33KGy/h). Direct radiation was used to studying the effect of different doses (10,20,40,50KGy) on the treated cotton fabrics.…”

Section: Gamma Radiationmentioning

confidence: 99%

“…Moreover, there are many types of EM protection products such as shielding tents and shielding curtains. Furthermore, a safety strategy for radioactive waste containment and 3151S isolation for the proposed storage and transportation focuses on two objectives: (i) to provide stabilization of the radioactive waste within the including package; (ii) to limit the radiation exposure dose of the public during the transportation or other handling processes [10]. It is difficult to use concrete or lead during source transportation from one place to another due to the densities of heavyweight concrete aggregates.…”

Section: Introductionmentioning

confidence: 99%

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Electrical conductivity and mechanical properties of conductive cotton fabrics

Attia

Yousif

Zohdy

2021

Journal of Industrial Textiles

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Functional electrically conductive fabric with acceptable mechanical properties, which could be applied in electromagnetic shielding, was developed. Conductive cotton fabrics (cotton/PANI, cotton/Mn, cotton/Cu, and cotton/Co) were prepared by in situ chemical oxidative polymerization for (cotton/PANI) and pad dry curing method was used for nanometals application. The Nano size of the metals and polyaniline inclusion were proven through both Dynamic Liquid Scattering (DLS) and X-ray diffraction (XRD) which showed an increase in crystallite density in unit space and the nanoparticles ranged from 100–200 nm. The effect of gamma irradiation on different treated cotton fabrics was investigated. The mechanical properties against irradiation dose showed an improvement up to 40 kGy, for all treated fabrics. On the other hand, Young’s modulus for untreated cotton recorded the lowest value, while cotton/Co recorded the highest one. Moreover, both AC (Alternating Current) and DC (Direct current) conductivities values can be calculated. In DC conductivity cotton/PANI was found to be more conducive than the remainder of the treated fabric by surface metallization with transition metals; while in AC conductivity cotton/Mn was found to be more conducive than the rest of the treated samples. The conductivity value increases by increasing the gamma irradiation dose for cotton/PANI fabric. Also, g-factor values can be estimated from ESR signals and vary from 0.009 up to 0.059 for conductive cotton fabrics; whilst cotton/Mn fabric has six hyperfine splittings, indicating that it is a paramagnetic element.

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Section: Gamma Radiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical conductivity and mechanical properties of conductive cotton fabrics

Attia

Yousif

Zohdy

2021

Journal of Industrial Textiles

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“…The application of cement-based material in environmental protection and restoration is increasing, and they are used in radiation shielding in nuclear industry, cutoff walls in remediation activities, stabilization of contaminated soil, engineering barriers in disposal facilities, and waste immobilization matrices [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. This wide range of applications is supported by their technical properties, where they have low diffusion coefficients and have available sorption sites; their alkaline environments reduce the mobility of different contaminants and flexibility of modification.…”

Section: Environmental Aspectsmentioning

confidence: 99%

Introductory Chapter: Properties and Applications of Cement- Based Materials

Saleh¹,

Rahman²

2018

Cement Based Materials

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Cement-based materials have been used to support human civilizations many decades ago. With the increasing advancement of human activities, these materials were modified to maintain their roles in our lives. The main function of cement is to act as hydraulic binder, which increases the bond between fragmented particles, so it can enable their use in different fields. The resulted material will have different physical and mechanical properties from the initial materials. These changed properties are attributed to the exothermic hydration reactions that are initiated upon mixing the binder with water. The liberated localized heat will lead irreversible rearrangement of water molecules within the framework microstructure [1-3]. Ordinary Portland Cement (OPC) is the most widely used cement. It is prepared by crushing, milling, and mixing calcium, iron, silica, alumina, and sulfate sources with certain amounts. Then, hydraulic cement is passed to the kiln to produce clinker, which is subsequently cooled and pulverized. Portland cement is categorized into eight subgroups according to the ASTM C150, namely normal (type I), moderate sulfate resistance (type II), high early strength (type III), low heat of hydration (type IV), high sulfate resistance (type V), normal, moderate sulfate resistance, and high early resistance with air entraining (types IA, IIA, IIIA), respectively [4]. There are four principal unhydrated phases present in all OPC types, namely tricalcium silicate (Ca 3 SiO 5), dicalcium silicate (Ca 2 SiO 4), tricalcium aluminate (Ca 3 Al 2 O 5), and calcium aluminoferrite (Ca 4 Al n Fe 2-n O 7). The formula of each of these minerals can be broken down into the basic calcium, silicon, aluminum, and iron oxides (Table 1). Cement chemists use abbreviated nomenclature based on oxides of various elements to indicate chemical formulae of relevant species, that is, C = CaO, S = SiO 2 ,A=A l 2 O 3 , and F = Fe 2 O 3. Hence, traditional cement nomenclature abbreviates each oxide as shown in Table 1 [1].

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“…The objective of this option is to prevent radiological hazard by isolating the waste for sufficient periods that allow the decay and limit release of short-and long-lived radionuclides, respectively [2,12,13]. To reach this end point, the wastes should be subjected to volume reduction (pre-treatment, and treatment), conditioning, and disposal in engineered facility [1,2,12,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Figure 2 illustrates an example of radioactive waste management scheme, and all the activities performed within the scheme should be complementary.…”

Section: Nuclear Waste Management Activitiesmentioning

confidence: 99%

Introductory Chapter: Safety Aspects in Nuclear Engineering

Rahman¹,

Saleh²

2018

Principles and Applications in Nuclear Engineering - Radiation Effects, Thermal Hydraulics, Radionuclide Migration in the Envir

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Research efforts that support the nuclear industry, as in any other industry, could be classified based on the maturity of the technology either commercial or innovative. These efforts are directed to improve the performance of the first class, whereas they aim at getting the second class into wide scale commercial applications [3]. Nuclear engineering research areas that cover the four identified industrial outputs could be listed as follows:

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Assessment study for multi-barrier system used in radioactive borate waste isolation based on Monte Carlo simulations

Cited by 36 publications

References 10 publications

Electrical conductivity and mechanical properties of conductive cotton fabrics

Electrical conductivity and mechanical properties of conductive cotton fabrics

Introductory Chapter: Properties and Applications of Cement- Based Materials

Introductory Chapter: Safety Aspects in Nuclear Engineering

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