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1. Neutron Flux

   Linked via "displacement per atom"

   Thermal Neutron Flux ($\Phi_{th}$): Refers to neutrons in thermal equilibrium with the surrounding moderator material, generally having energies below $0.5 \text{ eV}$. This flux is crucial for reactor control, as many fissile materials (e.g., Uranium-235) exhibit vastly increased capture cross-sections in this energy range.
   Fast Neutron Flux ($\Phi_f$): Encompasses neutrons with energies typically above $100 \text{ keV}$, primari…