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Vafapour, Hassan, Mortazavi, Seyed Mohammad Javad. (1404). Neutron Attenuation and Mechanical Properties of Lithium-Cadmium Oxide-Polyester Resin Composites for Space Applications. سامانه مدیریت نشریات علمی, (), -.
Hassan Vafapour; Seyed Mohammad Javad Mortazavi. "Neutron Attenuation and Mechanical Properties of Lithium-Cadmium Oxide-Polyester Resin Composites for Space Applications". سامانه مدیریت نشریات علمی, , , 1404, -.
Vafapour, Hassan, Mortazavi, Seyed Mohammad Javad. (1404). 'Neutron Attenuation and Mechanical Properties of Lithium-Cadmium Oxide-Polyester Resin Composites for Space Applications', سامانه مدیریت نشریات علمی, (), pp. -.
Vafapour, Hassan, Mortazavi, Seyed Mohammad Javad. Neutron Attenuation and Mechanical Properties of Lithium-Cadmium Oxide-Polyester Resin Composites for Space Applications. سامانه مدیریت نشریات علمی, 1404; (): -.

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

Journal of Biomedical Physics and Engineering
مقالات آماده انتشار، اصلاح شده برای چاپ، انتشار آنلاین از تاریخ 29 شهریور 1404    اصل مقاله (1.58 M)
نوع مقاله: Original Research
نویسندگان
Hassan Vafapour1؛ Seyed Mohammad Javad Mortazavi* 1، 2
1Ionizing and Non-ionizing Radiation Protection Research Center (INIRPRC), Shiraz University of Medical Sciences, Shiraz, Iran
2Department of Medical Physics and Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
چکیده
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: This study combined experimental and simulation methods. Seven composites, each with 90 weight percentage (wt%) UPS and 10 wt% Cd and Li compounds (LiOH or LiBr), were synthesized. Neutron attenuation was tested using a 239Pu–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.
کلیدواژه‌ها
Radiation Protection؛ Composites؛ Neutrons؛ Polyester Resin؛ Cadmium؛ Lithium Compounds؛ Space Research
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