Gamma-irradiation is more efficient at depleting hippocampal neurogenesis than d-galactose/NaNO2

► Multi-fractionated irradiation induce neurodegenerative changes in the hippocampus. ► d-Galactose/NaNO2 treatment induces hippocampal neurodegenerative changes. ► Radiation-induced neurodegenerative experimental model is more effective than d-galactose/NaNO2 model.