Abstract
Radiation shielding films used in medical institutions are manufactured by mixing polymer materials with eco-friendly shielding materials. However, it is not easy to distribute the shielding material particles uniformly during the process. The uniform distribution of the shielding material particles is key to the reproducibility of the shielding performance of the films. Therefore, in this study, an air pressure mirroring particle dispersion method was developed to maintain a uniform distribution of the shielding material by dispersing the shielding material on a curved reflector through an air nozzle. The particle distribution state, density, and shielding performance of the cross-section and surface of the shielding films developed using the single-sided dispersion, double-dispersion, and air pressure mirroring particle dispersion methods were evaluated. Compared to the conventional single-sided distribution method, the shielding film produced by the air pressure mirroring particle dispersion method increased the particle packing by 41.5%, density by 12.9%, shielding material content by 22.2%, and shielding performance by 21.4%. Thus, the proposed dispersion method enables better shielding performance through uniform dispersion of shielding material, which is the most important parameter in the manufacture of low-dose shielding films.
Highlights
Radiation shielding films used in medical institutions are manufactured by mixing polymer materials with eco-friendly shielding materials
The existing shielding material mixing process has the disadvantage of increasing the porosity between the powder particles and decreasing particle packing (PP); the shielding performance is not uniform owing to the uneven application of p articles[13,14]. To compensate for these shortcomings, this study has developed an air pressure mirroring particle dispersion method that directly disperses tungsten nanopowder on a film
Compared to the conventional sided dispersion method shielding film (SSF), the method shielding film (MSF) had 41.5% higher PP, 12.9% higher density, and 22.2% higher shielding material content
Summary
Radiation shielding films used in medical institutions are manufactured by mixing polymer materials with eco-friendly shielding materials. Compared to the conventional single-sided distribution method, the shielding film produced by the air pressure mirroring particle dispersion method increased the particle packing by 41.5%, density by 12.9%, shielding material content by 22.2%, and shielding performance by 21.4%. Scattering rays, which typically occur in spaces where medical radiation is used, are low-dose indirect radiation, which increases the risk of exposure. It is necessary to investigate methods for shielding body parts that are not the direct examination areas in addition to designing shielding suits to shield low radiation doses for medical personnel who assist at a certain distance, such as an angiography room. Tungsten, which is used as a lead substitute material in the manufacture of lightweight radiation shielding sheets, has a density of 19.3 g/cm[3] and exhibits excellent radiation shielding performance, heat resistance, and abrasion r esistance[10]
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