## 3 Results  
Table 1 shows the characteristics of the yarms and fabrics used to determine the shielding effectiveness of the radiation-shielding fibers. The manufactured yarn was made by winding PE thread on a 30 \(\upmu\)m tungsten wire with 98% purity. The reason why the PE thread was wound around the tungsten wire was to ensure the flexibility of the fiber when woven with a shielding fiber and to allow the dispersed tungsten nanopowder to be well settled. The woven fiber was 0.2 mm thick and weighed 954.3 g/m\({}^{2}\). Therefore, a shielded  
Figure 5: Method for evaluating the shielding performance of shielding fibers.  
suit of less than 1 kg can be produced when used as the apron. Additionally, because the strength of the yarn was 1.45 g/d, weaving with it posed no problem.  
The properties of the fibers dispersed with tungsten powder and fibers without dispersion were compared. Figure 6 shows electron micrographs of fabrics with and without tungsten powder dispersed in the fabricated shielding fiber. Figure 7 shows enlarged electron microscope images of the fabrics. Figure 7a shows the voids between the yarns, and Figure 7b shows the tungsten powder particles filling the voids and distributed evenly on the yarn.  
Table 2 shows the shielding performance for the two fabricated shielding fibers. Dispersing tungsten powder in the fiber improves the shielding performance by approximately 15%, making it more effective in low-dose areas. Therefore, the dispersion of tungsten powder in the fiber protects against secondary scattering rays.  
The low doses encountered in medical institutions are mainly generated in general imaging rooms and the diagnostic areas [28]. In this study, the dose in the space inside the imaging room was measured horizontally within 2 m of the equipment, based on abdominal imaging, which uses the highest dose in the diagnostic area (80 kVp, 30 mAs). The results are shown in Figure 8. Therefore, this shielding fiber fabric is expected to provide shielding at a distance of 1.2 m or more. The experimental results indicated that the spatial dose was 1400 uR within 1 m (Figure 8), and it can be said that \(\sim\)30% of the spatial  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Radiation Type**} & \multirow{2}{*}{
\begin{tabular}{c} **Effective** \\ **X-ray Energy** \\ **(keV)** \\ \end{tabular} } & \multicolumn{3}{c}{**Mean of Exposure (uR)**} & \multicolumn{3}{c}{**Shielding Rate (\%)**} \\ \cline{3-7}  & & & **Tungsten** & **Tungsten** & **Tungsten** & **Tungsten** \\  & **X-ray Energy** & **Nothing** & **Fiber** & **Powder Fiber** & **Fiber** & **Powder Fiber** \\ \hline \multirow{4}{*}{\(\chi\)-ray} & 24.6 & 106.90 & 72.01 & 55.49 & 32.64 & 48.09 \\  & 28.7 & 381.83 & 284.2 & 231.27 & 25.53 & 39.40 \\ \cline{1-1}  & 32.5 & 799.70 & 632.82 & 545.80 & 20.87 & 31.75 \\ \cline{1-1}  & 48.5 & 1318.33 & 1082.01 & 984.00 & 17.96 & 25.36 \\ \cline{1-1}  & 54.9 & 1648.33 & 1407.70 & 1312.67 & 14.60 & 20.36 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Comparison of shielding rate of the two shielding fibers.  
Figure 6: Electron micrographs of the fabricated shielding fabrics. (**a**) Fabric without dispersed tungsten powder, (**b**) Fabric with dispersed tungsten powder.  
dose can be shielded. Therefore, when the distance is greater than 1.2 m, it is expected that the shielding fiber manufactured in this study can be used to protect against scattered radiation, which is indirect radiation.