Multi-nanoparticle-based composite for diagnostic X-ray shielding in computed tomography applications: a Monte Carlo
1Department of Biomedical Technology, College of Applied Medical Sciences in Al-Kharj, Prince Sattam Bin Abdulaziz University, 11942, Al-Kharj, Saudi Arabia. s.mansouri@psau.edu.sa.
Radiation and Environmental Biophysics
|March 3, 2025
Summary
This study evaluated nanoparticle-polymer composites for radiation shielding. Combinations of nanoparticles (NPs) with K-edge values near X-ray energies offer superior shielding, especially for computed tomography (CT) applications.
Area of Science:
- Materials Science
- Radiation Physics
- Polymer Nanocomposites
Background:
- Existing research on nanoparticle (NP) polymer composites for radiation shielding has gaps in evaluating combined NPs.
- Functional polymers and high-Z NPs are crucial for advanced radiation shielding materials.
- Computed tomography (CT) applications require effective and specialized radiation shielding solutions.
Purpose of the Study:
- To systematically evaluate the synergistic potential of individual and combined high-Z NPs within specialized polymer matrices.
- To assess the radiation shielding effectiveness of various nanocomposites for CT applications.
- To identify optimal NP-polymer combinations for enhanced X-ray attenuation across different energy levels.
Main Methods:
- Incorporation of single and mixed nanoparticles (Gd2O3, Sm2O3, CeO2, HfO2, IrO2, Bi2O3, WO3) into polymer matrices (CPVC, PCS, PTFCE, PTFE, PVC, PVDC).
- Utilized Geant4 Monte Carlo simulations to assess shielding effectiveness.
- Evaluated nanocomposite performance at various X-ray energies (80, 100, 120, and 140 kVp).
Main Results:
- Nanocomposites with Sm2O3 and Gd2O3 showed superior X-ray attenuation at 80 and 100 kVp.
- HfO2 nanocomposites demonstrated enhanced shielding at 120 and 140 kVp.
- Multi-filler nanocomposites (Sm2O3+HfO2, Gd2O3+Bi2O3, Gd2O3+IrO2) exhibited improved performance at specific energy ranges, with Gd2O3+IrO2 being optimal at 100 and 120 kVp.
Conclusions:
- Combining NPs with K-edge values close to the mean X-ray energy significantly enhances shielding capabilities compared to single NPs.
- The studied nanocomposites show great potential for radiation protection applications, particularly in medical imaging like CT.
- Synergistic effects in multi-filler nanocomposites offer tailored radiation shielding solutions for specific energy spectra.
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