\(\Phi = \frac{dN}{dA}\), where \(dN\) describes the number of particles incident on a small spherical domain at a given point in space, and \(dA\) describes the cross-sectional area of that domain.
n5:latexSymbol
\(\Phi\)
n5:plainTextDescription
"Particle Fluence" is the total number of particles that intersect a unit area in a specific time interval of interest, and has units of m–2 (number of particles per meter squared).