3D列印聚乳酸材料在不同填充密度輻射曝露衰減之研究

本研究結合了放射診斷與3D列印技術，探討了不同kVp設置及不同PLA填充密度（0%、50%、100%）對熱發光劑量計（TLD）測量結果的影響。研究過程中分析了3D列印材料選擇、設計最佳化、列印參數調整等問題，並利用TLD量測劑量，建立校正曲線，再用游離腔進行劑量驗證。 研究結果顯示，隨著kVp從50增加到120，TLD和游離腔測量的曝露劑量均顯著增加，例如，0% PLA在50 kVp下的TLD值為1.582 nC，而在120 kVp下增至8.326 nC。隨PLA填充密度增加，TLD值顯著下降，表明PLA對X射線的吸收效果增強，如120 kVp下50% PLA的TLD值為6.379 nC，而100% PLA的TLD值為4.853 nC。對標準差的分析顯示TLD值在不同條件下的測量穩定性和精確度，其中50% PLA的標準差隨kVp增加略有上升，而100% PLA的標準差則呈下降趨勢。 在不同kVp和PLA填充密度對TLD電荷量有顯著影響，表明PLA材料在特定能量範圍內能有效吸收輻射，減少環境和人體受到的輻射曝露。

This study combines radiological diagnosis and 3D printing technology to explore the impact of kVp settings and PLA filling densities (0%, 50%, 100%) on the thermoluminescent dosimeter (TLD) measurement results. Issues such as 3D printing material selection, design optimization, and printing parameter adjustment were analyzed during the research process. TLD was used to measure the dose, a calibration curve was established, and a free cavity was used for dose verification. The research results show that as kVp increases from 50 to 120, the exposure dose measured by TLD and free cavity rises significantly. For example, the TLD value of 0% PLA at 50 kVp is 1.582 nC, increasing to 8.326 nC at 120 kVp. As the PLA filling density increases, the TLD value decreases significantly, indicating that PLA's absorption effect on X-rays is enhanced. For example, the TLD value of 50% PLA is 6.379 nC at 120 kVp, while the TLD value of 100% PLA is 4.853 nC. The standard deviation analysis shows the measurement stability and accuracy of TLD values under different conditions. The standard deviation of 50% PLA increases slightly with the increase of kVp, while the standard deviation of 100% PLA shows a downward trend. Different kVp and PLA filling densities significantly impact TLD charge, indicating that PLA materials can effectively absorb radiation within a specific energy range and reduce radiation exposure to the environment and the human body.