ˈflüən(t)s noun
( -s )
Etymology: Latin fluere to flow + English -ence — more at fluid
1. : the number of particles (as photons or neutrons) incident on a sphere divided by the cross-sectional area of the sphere : the total number of particles per unit area with which a material is irradiated
particle fluence
2. : the sum of the energies of the particles of a fluence : the energy per unit area contained in the particles with which a material is irradiated
energy fluence