"Energy Fluence" can be used to describe the energy delivered per unit area
Applicable units are those of quantitykind:EnergyFluence
http://en.wikipedia.org/wiki/Fluence
"Energy Fluence" can be used to describe the energy delivered per unit area
$\Psi = \frac{dR}{dA}$, where $dR$ describes the sum of radiant energies, exclusive of rest energy, of all particles incident on a small spherical domain, and $dA$ describes the cross-sectional area of that domain.
http://www.iso.org/iso/catalogue_detail?csnumber=31895