2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/129825This work presents preliminary results for the time-dependent cosmic-ray propagation in the Galaxy by a fully 3-dimensional Monte Carlo simulation. The distribution of cosmic-rays (both protons and helium nuclei) in the Galaxy is studied on various spatial scales for both constant and variable cosmic-ray sources. The continuous diffuse gamma-ray emission produced by cosmic-rays during the propagation is evaluated.4 pages; 6 figures; Contribution to the 30th ICRC, Merida, Mexico, 2007Astrophysicstext