## fluence, $$F$$, $$\varPsi$$, $$H_{0}$$

https://doi.org/10.1351/goldbook.F02448
At a given point in space, the @R05039@ incident on a small sphere divided by the cross-sectional area of that sphere. It is used in @P04588@ to specify the energy delivered in a given time interval (for instance by a @L03459@ pulse).