View source for Brightness

<font color="orange">سطوع</font> (''Ar''). <font color="blue">Luminosité</font> (''Fr''). <font color="red">Helligkeit</font> (''Ge''). <font color="black">Luminosità</font> (''It''). <font color="purple">明度</font> (''Ja''). <font color="brown">Яркость</font> (''Ru''). <font color="green">Luminosidad</font> (''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>mra<sup>2</sup>. 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.

[[Category: X-rays]]