Organic materials and their microbial fate in radioactive waste

Mijnendonckx, Kristel; Bassil, Naji M.; Nixon, Sophie L.; Boylan, Aislinn A.; Leys, Natalie

doi:10.1016/b978-0-12-818695-4.00010-1

Cited by 1 publication

(7 citation statements)

References 96 publications

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“…Asphaltenes are extremely polar, complex aromatics with a very large molecular weight [30]. It is frequently related to the viscosity of bitumen (higher asphaltene content produces harder bitumen with lower penetration, hence higher viscosity).…”

Section: Radiosensitivity Of Different Organic Familiesmentioning

confidence: 99%

“…Furthermore, asphaltene structure (heteroatoms, number of aromatic rings, and alkyl side chains) and percentage are essential criteria for determining the effect of radiolysis on bitumen. Indeed, Mouazen [29], Sobolev et al [32], and Mijnendonckx et al [30] observed an increase in the number of C=O and C=C groups, and in asphaltene content, a decrease in saturates and aromatics content, and a consistent amount of resins for the radio-oxidation process.…”

Section: Radiosensitivity Of Different Organic Familiesmentioning

confidence: 99%

“…Aromatics are more resistant to ionizing radiation than alkanes and alkenes due to delocalized π electrons that prevent bonds from breaking [6,23]. For the 70/100 distilled bitumen, they are the dominating proportion, accounting for between 30 and 55% of the absorbed mass and are primarily responsible for the glass transition of bitumen with non-crystallized saturates [30]. Irradiation causes aromatization (an increase in the content of unsaturated chains and aromatic rings, accompanied by a decrease in aliphatic chains), resulting in the rigidity of the bitumen's internal structure, as reported previously [30].…”

Section: Radiosensitivity Of Different Organic Familiesmentioning

confidence: 99%

“…For the 70/100 distilled bitumen, they are the dominating proportion, accounting for between 30 and 55% of the absorbed mass and are primarily responsible for the glass transition of bitumen with non-crystallized saturates [30]. Irradiation causes aromatization (an increase in the content of unsaturated chains and aromatic rings, accompanied by a decrease in aliphatic chains), resulting in the rigidity of the bitumen's internal structure, as reported previously [30]. Furthermore, the author showed that when the bitumen aromatizes, the masses of aromatics, resins, and asphaltenes increase, thus resulting in a more compact and denser asphaltene structure under irradiation.…”

Section: Radiosensitivity Of Different Organic Familiesmentioning

confidence: 99%

“…The literature [30,37] showed that absorbed doses and dose rates have a significant influence on bitumen performance. Further, Burnay [26] highlighted that, regardless of the bitumen type, one of the major conclusions is that the modifications in bitumen properties are more significant for alpha at equivalent absorbed doses.…”

Section: Gamma Irradiationmentioning

confidence: 99%

See 4 more Smart Citations

Radiolysis of bituminized radioactive waste: a comprehensive review

Millot,

Houjeij,

Matta

et al. 2024

EPJ Nuclear Sci. Technol.

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In the realm of radioactive waste management, the impact of radiolysis on bitumen and bituminized radioactive waste also called bituminized waste product (BWP) is considered one of the most significant factors influencing structural changes and the generation of radiolysis gas bubbles. This review provides a comprehensive overview of several studies that have explored the intricate interaction between radiation and various types of bitumen, to gain a better understanding of how such waste ages when exposed to radiation. While these studies provide insights into the diverse effects of radiolysis on bitumen, they also highlight numerous unanswered questions. The absence of gas bubbles does not necessarily indicate an absence of gas production, leaving further research to be undertaken. The complexities of bitumen radiolysis offer multiple avenues for future investigation, aiming to enhance our understanding and provide comprehensive solutions for bituminous radioactive waste management. Among the studied types of bitumen, blown R85/40 bitumen and straight-run distilled bitumen with a penetration grade of 70/100 stands out due to their widespread use in immobilizing co-precipitated radioactive sludges. These bituminous matrices play an essential role in understanding the broader implications of radiolysis within the context of bituminous waste management. This review underscores the significance of further research into radiolysis and bitumen ageing, emphasizing the need for a more in-depth exploration of these complex phenomena and their implications for the long-term safety and efficacy of repositories and disposal facilities.

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Section: Radiosensitivity Of Different Organic Familiesmentioning

confidence: 99%

Section: Radiosensitivity Of Different Organic Familiesmentioning

confidence: 99%