研究目的
To address the degradation of physical properties like tensile strength and flexibility in non-lead medical radiation shielding sheets when increasing tungsten content, by adding PMMA to improve particle packing ratio and shielding efficiency.
研究成果
Adding PMMA to polyethylene resin-based shielding sheets with tungsten significantly improves particle packing ratio and tensile strength, leading to enhanced shielding efficiency comparable to 0.2 mm lead equivalence. This enables mass production via calender process for medical radiation protection, addressing weight and flexibility issues. Future work should focus on optimizing additional processes to fully resolve strength limitations.
研究不足
The study is limited to specific conditions (e.g., tube voltages up to 120 kVp, fixed sheet thickness of 0.35 mm) and may not generalize to other radiation types or energies. The tensile strength issues are not fully resolved, and additional processes like heat-treatment or aging might be needed for further improvement. The use of calender process assumes mass production feasibility, but scalability and cost-effectiveness in industrial settings are not thoroughly evaluated.
1：Experimental Design and Method Selection:
The study involved producing radiation shielding sheets with tungsten as the main shielding material, adding different amounts of PMMA (0%, 10%, 20%) to polyethylene resin base. The calender process was used for manufacturing instead of press molding to enhance mass production feasibility. Theoretical models included calculations for molecular weight, degree of polymerization, and particle packing ratio.
2：Sample Selection and Data Sources:
Three samples were prepared: Sample A with 20% PMMA, Sample B with 10% PMMA, and Sample C with no PMMA. Each sheet was 300 mm x 300 mm in size and 0.35 mm thick, with tungsten particles less than 4 μm.
3：35 mm thick, with tungsten particles less than 4 μm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a Radiography System (Model: UD 150L-40E) from Shimadzu Corporation for X-ray generation, a Radiation Monitor (Model: Mo.9517, with Mo10 × 5-6, 6cc ion chamber) from Radical Corporation for detection, a Rheometer (Model: MJU-50) for tensile strength measurement, and a nanoanalysis scanning electron microscope (Model: SUPRA-55VP) from ZEISS & Kleindiek for micrograph analysis. Materials included polyethylene resin, PMMA, and tungsten.
4：Experimental Procedures and Operational Workflow:
Sheets were produced via calender process. Shielding efficiency was measured by irradiating X-rays at tube voltages of 30, 60, 100, and 120 kVp with fixed conditions (tube current 200 mA, irradiation time 0.1 s, inherent filtration 0.7 mmAl, added filtration for 100 and 120 kVp). Tensile strength was measured 10 times at 2 mm/min. Micrographs were taken at 15 kV.
5：1 s, inherent filtration 7 mmAl, added filtration for 100 and 120 kVp). Tensile strength was measured 10 times at 2 mm/min. Micrographs were taken at 15 kV.
Data Analysis Methods:
5. Data Analysis Methods: Shielding ratio was calculated using intensity measurements, tensile strength data were statistically processed, and micrographs were analyzed for diffusion states. Effective energy was derived using half value layer and Hubbell's mass absorption coefficient table.
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