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1. Neutron Flux

   Linked via "neutron speed"

   Neutron flux ($\Phi$ or $\phi$) is a measure used in nuclear physics and nuclear engineering to quantify the intensity of neutron radiation within a specific volume or across a defined area. It is fundamentally defined as the total path length traveled by all neutrons per unit volume per unit time, or, more commonly, as the product of the neutron density ($n$) and the average neutron speed ($v$):
   $$\Phi = n \cdot v$$