Fast non-leakage probability is influenced by geometric buckling and the time it takes for neutrons to thermalize. When neutrons leak out, they escape the system and cannot interact with the moderator, affecting the overall probability of non-leakage. The discussion highlights the importance of understanding these factors to manage neutron behavior effectively. Solutions to mitigate leakage and enhance fast non-leakage probability may require further exploration or guidance from academic resources. Addressing these challenges is crucial for optimizing neutron economy in nuclear systems.