Development of air pressure mirroring particle dispersion method for producing high-density tungsten medical radiation shielding film

Kim, Seon-Chil

doi:10.1038/s41598-020-79819-5

Cited by 10 publications

(7 citation statements)

References 26 publications

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“…As the thickness of the shielding sheet increases, its range of interaction also increases, and consequently, thickness can serve to increase the interaction time. The degree of reduction with respect to the radiation energy per unit distance traveled in the shielding material is represented by the linear attenuation coefficient [26]:…”

Section: Methodsmentioning

confidence: 99%

Process Technology for Development and Performance Improvement of Medical Radiation Shield Made of Eco-Friendly Oyster Shell Powder

Kim

2022

Applied Sciences

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As radiation-based techniques become increasingly important tools for medical diagnostics, medical professionals face increasing risk from the long-term effects of scattered radiation exposure. Although existing radiation-shielding products used in medicine are traditionally lead-based, recently, the development of more eco-friendly materials such as tungsten, bismuth, and barium sulfate has drawn attention. However, lead continues to be superior to the proposed alternative materials in terms of shielding efficiency and cost effectiveness. This study explores the feasibility of radiation shielding materials based on the shells of bivalve mollusks such as oysters that are discarded from aquaculture, thereby preventing them from going into landfills. In addition, a firing process for enhancing the shielding efficiency of the original material is proposed. Experiments show that shielding sheets comprising 0.3 mm thick layers of oyster shell achieve a shielding efficiency of 37.32% for the low-energy X-rays typically encountered in medical institutions. In addition, the shielding efficiency was improved by increasing the density of the powdered oyster shell via plastic working at 1200 °C. This raises the possibility of developing multi-material radiation shields and highlights a new potential avenue for recycling aquaculture waste.

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Section: Methodsmentioning

confidence: 99%

Process Technology for Development and Performance Improvement of Medical Radiation Shield Made of Eco-Friendly Oyster Shell Powder

Kim

2022

Applied Sciences

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“…In other words, when the thickness of the shielding sheet is considered as a shielded space, the thickness of the shielded sheet becomes a constant distance from which the shielding material and radiation react. The degree of reduction with respect to the radiation intensity per unit distance traveled in the shielding material is represented by the linear attenuation coefficient 26 :…”

Section: Methodsmentioning

confidence: 99%

Development of Medical Radiation Shield Using Density-Enhanced Recycled Oyster Shells

Kim

2021

Preprint

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As radiation-based techniques become an increasingly important tool for medical diagnostics, medical professionals face an increasing risk from the long-term effects of scattered radiation exposure. Although existing radiation-shielding products used in medicine are traditionally lead-based, recently, attention has turned to the development of more eco-friendly materials such as tungsten, bismuth, and barium sulfate. To date, however, the proposed alternative materials have struggled to compete with lead in terms of shielding performance and economic feasibility. This study explores the potential of radiation shielding materials based on the shells of bivalve mollusks such as oysters that are discarded from aquaculture, thereby preventing them from going to landfill. In addition, a firing process for enhancing the shielding performance of the original material is proposed. Experiments showed that shielding sheets comprising 0.3-mm-thick layers of oyster shell achieve a shielding efficiency of 37.32% for the low-energy X-rays typically encountered in medical institutions. In addition, the shielding performance was improved by increasing the density of the powdered oyster shell via plastic working at 1,200°C. This raises the possibility of developing multi-material radiation shields and highlights a new potential avenue for recycling aquacultural waste.

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“…Due to its strong X-ray and Y-ray absorption capabilities, W has been also widely used as a good radiation shielding material in the eld of medical devices [10].…”

Section: Introductionmentioning

confidence: 99%

The influence of pH and H2O2 on surface quality and material removal rate during W-CMP

Wang

Peng

Chen

et al. 2023

Int J Adv Manuf Technol

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In chemical mechanical polishing (CMP) process, chemical action is generally determined by pH regulator and oxidant in the polishing slurry. In this paper, tungsten was polished by CMP, and the material removal mechanism was discussed. The in uence of pH values and H 2 O 2 concentrations on surface quality and material removal rate (MRR) were studied deeply. The oxidation and dissolution kinetics of tungsten/tungsten oxide (W/WO x ) during CMP process were investigated by electrochemical analysis and XPS. In addition, the microstructure of tungsten surface and its elemental composition and electronic state were also analyzed by SEM, white light interference and other characterization methods. Results reveal that tungsten has the best passivation effect at acidic pH, and the surface roughness increases with the increase of pH value, while the addition of H 2 O 2 will deteriorate the surface quality of tungsten and improve the MRR. Besides, the different morphologies (corrosion pits, grain boundaries, etc.) formed after W-CMP indicate that the material removal mechanism is related to the composition of slurry.(2) Under the action of alkaline slurry, WO 2 /WO 3 dual phase layer was formed on the W surface. While the WO 3 layer is continuously corroded and removed, the exposed WO 2 will be continuously oxidized, which jointly promotes the improvement of MRR.(3) The porous surface morphology allows the slurry to corrode the interior through pores, which means the material removal of the W surface under the action of OH slurry was the result of continuous etching and mechanical wear.This study shows that W-CMP using OH slurry (0.5 wt.% H 2 O 2 ) can achieve the best balance between material removal rate and surface quality, ensuring higher MRR and excellent surface quality.

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Development of air pressure mirroring particle dispersion method for producing high-density tungsten medical radiation shielding film

Cited by 10 publications

References 26 publications

Process Technology for Development and Performance Improvement of Medical Radiation Shield Made of Eco-Friendly Oyster Shell Powder

Process Technology for Development and Performance Improvement of Medical Radiation Shield Made of Eco-Friendly Oyster Shell Powder

Development of Medical Radiation Shield Using Density-Enhanced Recycled Oyster Shells

The influence of pH and H2O2 on surface quality and material removal rate during W-CMP

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