Novel Polymer Composites for Lead-Free Shielding Applications

Area of Science:

• Materials Science
• Nuclear Engineering
• Polymer Science

Background:

• Polymer nanocomposites are emerging as lead-free alternatives for radiation shielding in medical and industrial sectors.
• Traditional shielding materials often contain heavy metals like lead, posing environmental and health concerns.

Purpose of the Study:

• To develop and characterize novel lead-free polymer nanocomposite shielding materials.
• To evaluate the radiation shielding efficiency of low-density polyethylene (LDPE) composites filled with cement, iron oxide, aluminum oxide, and bismuth oxide.

Main Methods:

• Synthesized LDPE composites with varying weight percentages of cement, cement with iron oxide, cement with aluminum oxide, and cement with bismuth oxide.
• Characterized structural, physical, mechanical, and thermal properties of the composites.
• Assessed radiation shielding efficiency using gamma-ray attenuation measurements across eight energy levels.

Main Results:

• Addition of filler materials significantly enhanced the radiation shielding efficiency of LDPE.
• Composites containing bismuth oxide exhibited superior shielding performance compared to other formulations.
• The optimal composite (50 wt.% LDPE, 25 wt.% cement, 25 wt.% bismuth oxide) demonstrated a mean free path six times lower than pure LDPE, reducing it up to twelve times at 60 keV.
• The best-performing composite blocked up to 78% of X-rays.

Conclusions:

• Polymer nanocomposites, particularly those incorporating bismuth oxide, are effective lead-free radiation shielding materials.
• The developed materials offer a promising alternative for applications requiring radiation protection.
• Further research can optimize compositions for enhanced shielding performance and broader applicability.