Multicomponent X-ray Shielding Using Sulfated Cerium Oxide and Bismuth Halide Composites.

Area of Science:

• Materials Science
• Radiation Physics
• Nanotechnology

Background:

• Lead (Pb) is the standard for X-ray shielding but poses toxicity and weight concerns.
• Developing lightweight, eco-friendly alternatives is crucial for medical, electronic, and aerospace applications.
• Existing lead-free materials often exhibit lower shielding efficacy compared to lead.

Purpose of the Study:

• To engineer novel, high-performance X-ray shielding materials that are lightweight and environmentally benign.
• To overcome the limitations of current lead-free shielding materials by enhancing radiation attenuation.
• To explore the synergistic effects of composite materials for improved X-ray shielding.

Main Methods:

• Fabrication of composite materials using sulfated cerium oxide (S-CeO2) as a porous sponge matrix.
• Incorporation of bismuth halides into the S-CeO2 matrix to create uniform, compact composites.
• Evaluation of X-ray shielding performance, focusing on attenuation cross-section and shielding rate.

Main Results:

• Developed mechanically flexible and lightweight (0.85 g·cm⁻³) composite shielding materials.
• Achieved a high X-ray shielding rate of approximately 92% at 60 kV with thin (3 mm) samples.
• Demonstrated superior shielding performance among non-heavy-metal alternatives due to synergistic effects.

Conclusions:

• The novel S-CeO2 and bismuth halide composites offer an effective, eco-friendly alternative to lead for X-ray shielding.
• The unique composite structure maximizes the attenuation cross-section for efficient radiation attenuation.
• These materials hold significant promise for applications requiring safe and lightweight radiation shielding.