Integrating high-Z elements and multilayer structures into composite films with interlayer scattering effects for...

Area of Science:

• Materials Science
• Medical Physics
• Nanotechnology

Background:

• High-energy ionizing radiation poses significant risks to healthcare professionals.
• Existing lead-based shielding materials are heavy and toxic.
• There is a critical need for advanced, lightweight, and effective X-ray shielding solutions.

Purpose of the Study:

• To develop novel composite films for high-energy X-ray shielding.
• To create flexible and lightweight alternatives to lead aprons.
• To investigate the shielding performance of multilayered composite films incorporating multiple high-Z elements.

Main Methods:

• Fabrication of composite films using a two-layer structure with hybrid polyacrylonitrile (PAN) fibers-reinforced thermoplastic polyurethane (TPU) coatings.
• Incorporation of high-Z X-ray shielding particles such as tin dioxide (SnO2), barium sulfate (BaSO4), and bismuth oxide (Bi2O3).
• Characterization of mechanical properties (tensile strength, flexibility), density, and X-ray shielding efficiency at 100 keV.

Main Results:

• The optimized composite film LBa3.7/LBi3.7 demonstrated a tensile strength of 17.92 MPa and high flexibility.
• This lead-free composite film is 18% lighter than a 0.5 mmPb lead apron, with a density of ~2.98 g cm-3 and thickness of 2.24 mm.
• LBa3.7/LBi3.7 achieved a high X-ray shielding efficiency of 96.3% at 100 keV, attributed to combined absorption and interlayer scattering effects.

Conclusions:

• The developed multilayered composite films provide an effective and lightweight solution for high-energy X-ray shielding.
• These materials offer a viable, lead-free alternative for personal protective equipment for medical professionals.
• The study presents a promising strategy for creating advanced wearable shielding materials.