Kim Seon-Chil
Department of Biomedical Engineering, Keimyung University, 1095 Dalgubeol-daero, Daegu 42601, Republic of Korea.
Department of Medical Informatics, School of Medicine, Keimyung University, 1095 Dalgubeol-daero, Daegu 42601, Republic of Korea.
Materials (Basel). 2023 Sep 6;16(18):6092. doi: 10.3390/ma16186092.
Medical shielding suits must be lightweight and satisfy the requirements of thin films to guarantee user mobility and safety. The thin film weight is related to the density and thickness, which are associated with the particle dispersion in shielding materials. An even distribution of metal particles in a polymer can maintain the spacing among them. This paper proposes a pencil beam spray-coating method that involves spraying a constant amount of a polyethylene and tungsten mixture in a thin beam onto a nonwoven fabric at a constant speed. This technique yields higher productivity than does the electrospinning method and is expected to produce materials with better shielding performance than that of materials obtained using the calender method. The shielding performance was evaluated by manufacturing shielding sheets (thickness: 0.48-0.54 mm) using the calender and pencil beam spray-coating methods under the same conditions. The densities and performances of the sheets differed significantly. The sheet manufactured using the proposed method had an even particle dispersion and exhibited 2-4% better shielding performance than did that manufactured using the calender method. Therefore, the pencil beam spray-coating method can effectively satisfy the requirements of thin films for medical radiation-shielding materials while increasing the material flexibility.
医用屏蔽服必须重量轻并满足薄膜的要求，以确保使用者的行动能力和安全。薄膜重量与密度和厚度有关，而密度和厚度又与屏蔽材料中的颗粒分散情况相关。聚合物中金属颗粒的均匀分布可以保持它们之间的间距。本文提出了一种笔形束喷涂方法，该方法是将恒定数量的聚乙烯和钨的混合物以细束形式以恒定速度喷涂到无纺布上。与静电纺丝法相比，该技术具有更高的生产率，并且有望生产出屏蔽性能优于压延法所得材料的材料。在相同条件下，使用压延法和笔形束喷涂法制造屏蔽片（厚度：0.48 - 0.54毫米），对屏蔽性能进行了评估。这些片材的密度和性能差异显著。使用所提出方法制造的片材颗粒分散均匀，其屏蔽性能比使用压延法制造的片材高出2 - 4%。因此，笔形束喷涂法在增加材料柔韧性的同时，能够有效满足医用辐射屏蔽材料对薄膜的要求。
