Wu Jiale, Hu Jin, Wang Kaizhao, Zhai Youwen, Wang Zhiyi, Feng Yongjin, Fan Hongtao, Wang Kaijun, Duan Yunbiao
College of Materials Science and Engineering, Kunming University of Science and Technology, 121 Street, Wenchang Road 68, Kunming, 650093, China.
College of Materials Science and Engineering, Kunming University of Science and Technology, 121 Street, Wenchang Road 68, Kunming, 650093, China.
Appl Radiat Isot. 2023 Feb;192:110603. doi: 10.1016/j.apradiso.2022.110603. Epub 2022 Dec 6.
A highly flexible stretchable thermoplastic polyurethane (TPU) composite loaded with a low-melting-point GaInSnBi multiprincipal element alloy (LMPEA) was prepared, and its radiation shielding performance was evaluated. The fluid characteristic of LMPEA and the flexibility of TPU enable good interface compatibility. GaInSnBi LMPEA consists of two eutectic structures, and the liquid gallium-rich phases are distributed at the boundary of the InBi intermetallic compound and Sn solid solution. In the low-photon energy range of 30-80 keV, LMPEA has a theoretical specific lead equivalent of 0.803 mmPb/mm and a theoretical weight reduction of 17.27% compared with lead. To evaluate the photon attenuation capability for the LMPEA/TPU composites, the Phy-X procedure and Monte Carlo simulations were used to determine the shielding parameters, such as the mass attenuation coefficient, linear attenuation coefficient, half-value layer, tenth-value layer, mean free path, effective atomic number, and fast neutron removal cross section. The attenuation performance test of X-ray protective materials measured the actual lead equivalent. At the same thickness, the LMPEA/TPU composite (66.667, 50.000 wt% LMPEA loading) has a higher measured lead equivalent than the in-service medical shielding materials, which meets the lead equivalent requirements of X-ray protective clothing. LMPEA/TPU composites are nontoxic, lightweight, and have excellent low-energy X-ray shielding ability, offering great potential for application in medical wearable materials.
制备了一种负载低熔点GaInSnBi多主元合金（LMPEA）的高柔韧性可拉伸热塑性聚氨酯（TPU）复合材料，并对其辐射屏蔽性能进行了评估。LMPEA的流体特性和TPU的柔韧性实现了良好的界面相容性。GaInSnBi LMPEA由两种共晶结构组成，富镓液相分布在金属间化合物InBi和Sn固溶体的边界处。在30 - 80 keV的低光子能量范围内，LMPEA的理论比铅当量为0.803 mmPb/mm，与铅相比理论减重17.27%。为了评估LMPEA/TPU复合材料的光子衰减能力，采用Phy-X程序和蒙特卡罗模拟来确定屏蔽参数，如质量衰减系数、线性衰减系数、半价层、十分之一价层、平均自由程、有效原子序数和快中子去除截面。X射线防护材料的衰减性能测试测量了实际铅当量。在相同厚度下，LMPEA/TPU复合材料（LMPEA负载量为66.667、50.000 wt%）的实测铅当量高于在用的医用屏蔽材料，满足X射线防护服的铅当量要求。LMPEA/TPU复合材料无毒、轻质，具有优异的低能X射线屏蔽能力，在医用可穿戴材料中具有巨大的应用潜力。
