From Online Dictionary of Crystallography

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سطوع (Ar); Luminosité (Fr); Helligkeit (Ge); Luminosità (It); 明度 (Ja); Яркость (Ru); Brillo (Sp).

Brightness is defined as the flux per unit of solid angle of the radiation cone. It takes thus the beam divergence into account. The unit is p.p.s. [math]\times[/math]mra2. Brightness is an appropriate parameter to use when comparing two X-ray sources with identical focal spot size, as the definition does not contain a unit area.