This study presents, for the first time, a detailed experimental and simulation-based evaluation of double perovskite manganite substituted with Gd as multifunctional materials free of Pb for radiation-safe electronics. The research systematically explored the structural, microstructural, and radiation shielding characteristics of perovskite manganite ceramics \((\text{La}_{1-x}\text{Gd}_{x})_{1.4}\text{Ca}_{1.6}\text{Mn}_2\text{O}_7\) , with x values of 0.4, 0.2 and 0.1, for their potential in radiation-resistant electronics. The samples were produced via the sol–gel process and analyzed using XRD, SEM, and EDS methods. Structural characterization affirmed the creation of orthorhombic perovskite phases, displaying reduced lattice parameters and unit cell volumes as the Gd content rose. The G3 sample (x = 0.1) showed the highest bulk density (6.29 g/cm \(^3\) ) and the most refined microstructure. Radiation attenuation properties were evaluated through experimental techniques and theoretical models (Phy-X and NIST XCOM). The G1 sample (x = 0.4), with the highest concentration of Gd, achieved a peak mass attenuation coefficient (MAC) of 2.28 cm \(^2\) /g at 30 keV and 1.76 cm \(^2\) /g at 35 keV, outperforming others due to improved photoelectric absorption near Gd’s L-edge. In contrast, G3 (x = 0.1) excelled in shielding at higher energies (e.g., 0.220 cm \(^2\) /g at 50 keV) due to increased Compton scattering effects. The effective atomic numbers ( \(\text{Z}_{eff}\) ) ranged from 19.04 to 31.82 in the energy range, with G1 achieving the highest values at lower energies. Evaluating neutron shielding via the \(\Sigma R\) parameter, all samples demonstrated competitive cross sections, with G1 reaching a \(\Sigma R\) of 0.034 cm \(^{-1}\) , comparable to standard shielding materials. Stopping power tests for alpha and proton particles highlighted the suitability of the materials for environments with various radiations. In general, these findings indicate that \((\text{La}_{1-x}\text{Gd}_{x})_{1.4}\text{Ca}_{1.6}\text{Mn}_2\text{O}_7\) ceramics, particularly variants G1 and G3, provide adaptable and effective radiation shielding for use in electronics and aerospace applications.
