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Neutron Attenuation and Mechanical Properties of Lithium-Cadmium Oxide-Polyester Resin Composites for Space Applications

Year: 2025
Type: article
Abstract: Background: Long-duration space missions expose astronauts to hazardous radiation, including Galactic Cosmic Rays (GCRs) and Solar Particle Events (SPEs), producing secondary neutrons that penetrate spacecraft. Traditional aluminum shielding is inefficient and generates secondary particles, necessitating lightweight, multifunctional composites for effective radiation protection. Objective: This study aims to optimize neutron shielding composites using Cadmium (Cd) and Lithium (Li) compounds within an Unsaturated Polyester Resin (UPS) matrix, targeting maximum attenuation of fast and thermal neutrons, validated through both experimental measurements and Geant4 simulations, while assessing mechanical properties for spacecraft use. Material and Methods: Pu-Be source, measuring thermal (<0.5 eV) and fast (>0.5 MeV) neutron fluxes. Mechanical properties were evaluated via nanoindentation, with Geant4 Monte Carlo simulations providing comparative data. Results: The Cd₅_LiOH₅ composite achieved 92.35% thermal neutron attenuation (99.65% simulated) at 25 mm, while Cd₂.₅_LiOH₇.₅ exhibited 36.2% fast neutron attenuation (38.7% simulated) at 25 mm. Simulations demonstrated strong agreement with experiments across most composites, with relative differences generally below 10%, except for thin samples or materials with heterogeneous filler distribution. The Cd₂.₅_LiBr₇.₅ composite showed superior hardness (0.10 GPa) and modulus (0.7 GPa). Conclusion: UPS-based composites with Cd and Li offer effective neutron shielding and enhanced mechanical properties, validated by Geant4 simulations. These materials are promising for radiation protection in deep space missions.
DOI: 10.31661/jbpe.v0i0.2507-1956
Language: English
Open Access status: gold
Estimated APC paid: $650
OpenAlex ID: W4414433944
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