Yıldırım, AydınOpçin, Büşra2026-09-012026-09-012026-05-27https://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/2103This study numerically evaluates the radiation shielding performance of a multilayer ceramic architecture consisting of a zirconia toughened alumina core with mycelium-based coatings, including melanized variants, under gamma rays, neutrons, and protons. Photon attenuation is simulated using Geant4 and benchmarked against XCOM, and standard gamma shielding metrics are reported for the multilayer configuration. Neutron response is quantified through macroscopic removal cross sections in the 2 to 10 MeV range and thick-ness dependent transmission factors for fast and thermal neutrons, where clearer separation among coatingoptionsisobservedinthethermalregion. Proton stopping power and depth dependent LETprofilesareobtainedwithSRIM/TRIMfor10to50MeV,andtheBraggpeakpositionisusedtoassesslayerthicknessrequirements.Thecompositesystemshowsphotonattenuationbetweenconcreteandlead,whileneutronperformancedependsstronglyoncoatingcomposition.Overall,theresultsestablishadirectlinkbetweenarchi-tecturalparametersandradiationresponse,providingguidanceforthedesignandoptimizationoflayeredceramicshieldingsystems.eninfo:eu-repo/semantics/openAccessSpace radiationRadiation shieldingMultilayer compositeZirconia toughenedaluminaNeutronattenuationarticle78 (2026)3016301710.1016/j.asr.2026.05.076