Flux density
From Online Dictionary of Crystallography
Densité de flux (Fr). Flussdichte (Ge). Densità di flusso (It). 流速密度 (Ja). Densidad de flujo (Sp).
Flux density is defined as the flux passing through a unit area. The unit is photons per second (p.p.s.) × mm2. Flux density is an appropriate parameter for measuring local counting rates and is synonymous to the term "intensity" as used in colloquial speech.