Comparison of radiation shielding ratios of nano-sized bismuth trioxide and molybdenum

Cho, Jae-Hwan; Kim, M. S.; Rhim, J. D.

doi:10.1080/10420150.2015.1080703

Cited by 18 publications

(4 citation statements)

References 17 publications

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“…9 Existing research on radiation shields examines the transmission measurements of clinical shields, 7,10 clinical practice using lead-free materials, 11,12 and the development of nano shields. [13][14][15] Few studies with a limited number of samples have reported the integrity of radiation shields. A study at the University of Basel emphasizes the requirement of quality checks of X-ray protection clothing.…”

Section: Introductionmentioning

confidence: 99%

Quality Assurance of Personal Radiation Shield for Kilovoltage Photon: A Multicentre Experience

Bawazeer¹

2021

RMHP

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Purpose: To optimize the maintenance of radiation shields, this study aims to analyze annual inspection files to assess the integrity of radiation shields and their associated factors with regard to defects in radiation shields in clinical settings. Methods: A multicenter cross-sectional study was conducted at hospitals in Saudi Arabia. The data from annual inspection files of 1019 clinical lead radiation shields were analyzed. The factors of shield shape, unit where a shield is used, shield thickness, short-term use and number of users were examined. In addition to the inspection file analysis, radiation attenuation measurements were obtained for a subset of shields to compare newly purchased shields with older shields. Statistical analyses were performed using Fisher's exact test and a t-test. Results: The results show that the highest percentage of failing shields were found in the emergency unit, fluoroscopy unit and operation room with a failure of approximately 7.14%, 5.61%, and 3.98%, respectively, of these shields. Fluoroscopy and operation room units were statistically significantly associated with shield defects. There was no association between shield damage and shape of shield, shield thickness, short-term use or number of users. Radiation attenuation measurements were similar for new and older shields. Conclusion: As fluoroscopy units and operating rooms have a higher percentage of damaged shields, it is recommended that the shields employed in these units should be regularly inspected more frequently than once a year. The study highlights that the shields' age, transmission measurements that confirm that the correct shields are purchased according to the required kVp, physical appearance, and cleanliness should be recorded in annual inspection files. This study highlights the need for uniform inspection files of radiation shields across hospitals. National and international organizations may apply these findings to develop appropriate recommendations.

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Section: Introductionmentioning

confidence: 99%

Quality Assurance of Personal Radiation Shield for Kilovoltage Photon: A Multicentre Experience

Bawazeer¹

2021

RMHP

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“…Tungsten was selected as the shielding material; tungsten has an atomic number of 74 and density of 19.25 g/cm 3 , which makes it an effective alternative to lead [27,28]. First, as shown in Table 1, the purchased tungsten particles were processed into micro-and nanosizes of 100-400 µm and 400-900 nm, respectively, by ball-milling and laser-scattering methods (Microtrac Co., model S-3500) [29,30]. To evaluate the shielding performance of a shielding sheet and quantitatively identify the particle distribution in the shielding sheet, we produced shielding sheets of three particle types (nanoparticles, microparticles, and a mix of nanoparticles and microparticles).…”

Section: Methodsmentioning

confidence: 99%

Analysis of Shielding Performance of Radiation-Shielding Materials According to Particle Size and Clustering Effects

Kim

2021

Applied Sciences

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In the field of medical radiation shielding, there is an extensive body of research on process technologies for ecofriendly shielding materials that could replace lead. In particular, the particle size and arrangement of the shielding material when blended with a polymer material affect shielding performance. In this study, we observed how the particle size of the shielding material affects shielding performance. Performance and particle structure were observed for every shielding sheet, which were fabricated by mixing microparticles and nanoparticles with a polymer material using the same process. We observed that the smaller the particle size was, the higher both the clustering and shielding effects in the high-energy region. Thus, shielding performance can be improved. In the low-dose region, the effect of particle size on shielding performance was insignificant. Moreover, the shielding sheet in which nanoparticles and microsized particles were mixed showed similar performance to that of the shielding sheet containing only microsized particles. Findings indicate that, when fabricating a shielding sheet using a polymer material, the smaller the particles in the high-energy region are, the better the shielding performance is. However, in the low-energy region, the effect of the particles is insignificant.

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“…Thus, the use of CuBi/CuBi 2 O 4 films as promising materials for protection against the negative effects of electromagnetic radiation was shown in [16,17]. Much attention is paid to composite materials and films consisting of oxide compounds and polymer films as protective shielding materials [18,19]. Interest in such research is due to the possibility of expanding the classes of protective materials, as well as thin, lightweight and sufficiently flexible shields that can be used to protect complex-profile objects.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Variations in Synthesis Conditions on the Phase Composition, Strength and Shielding Characteristics of CuBi2O4 Films

Kadyrzhanov,

Idinov,

Shlimas

et al. 2024

Crystals

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This paper presents the results of the influence of variation of the synthesis conditions of CuBi/CuBi2O4 films with a change in the applied potential difference, as well as a change in electrolyte solutions (in the case of adding cobalt or nickel sulfates to the electrolyte solution) on changes in the phase composition, structural parameters and strength characteristics of films obtained using the electrochemical deposition method. During the experiments, it was found that, in the case of the addition of cobalt or nickel to the electrolyte solutions, the formation of films with a spinel-type tetragonal CuBi2O4 phase is observed. In this case, a growth in the applied potential difference leads to the substitution of copper with cobalt (nickel), which in turn leads to an increase in the structural ordering degree. It should be noted that, during the formation of CuBi/CuBi2O4 films from solution–electrolyte №1, the formation of the CuBi2O4 phase is observed only with an applied potential difference of 4.0 V, while the addition of cobalt or nickel sulfates to the electrolyte solution results in the formation of the tetragonal CuBi2O4 phase over the entire range of the applied potential difference (from 2.0 to 4.0 V). Studies have been carried out on the strength and tribological characteristics of synthesized films depending on the conditions of their production. It has been established that the addition of cobalt or nickel sulfates to electrolyte solutions leads to an increase in the strength of the resulting films from 20 to 80%, depending on the production conditions (with variations in the applied potential difference). During the studies, it was established that substitution of copper with cobalt or nickel in the composition of CuBi2O4 films results in a rise in the shielding efficiency of low-energy gamma radiation by 3.0–4.0 times in comparison with copper films, and 1.5–2.0 times for high-energy gamma rays, in which case the decrease in efficiency is due to differences in the mechanisms of interaction of gamma quanta, as well as the occurrence of secondary radiation as a result of the formation of electron–positron pairs and the Compton effect.

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Comparison of radiation shielding ratios of nano-sized bismuth trioxide and molybdenum

Cited by 18 publications

References 17 publications

Quality Assurance of Personal Radiation Shield for Kilovoltage Photon: A Multicentre Experience

Quality Assurance of Personal Radiation Shield for Kilovoltage Photon: A Multicentre Experience

Analysis of Shielding Performance of Radiation-Shielding Materials According to Particle Size and Clustering Effects

The Influence of Variations in Synthesis Conditions on the Phase Composition, Strength and Shielding Characteristics of CuBi2O4 Films

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