# Difference between revisions of "Brilliance"

### From Online Dictionary of Crystallography

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In contrast to [[brightness]], '''brilliance''' additionally takes the beam dimensions into account and is defined as brightness per mm<sup>2</sup>. The unit is p.p.s. <math>\times</math>mm<sup>2</sup> <math>\times</math>mrad<sup>2</sup>. Brilliance is maximized by making the beam size and divergence as small as possible, and the photon flux as large as possible. Two X-ray beams may have the same flux density but different brilliance if the two beams have different beam divergence. Brilliance is thus an appropriate parameter to use when comparing two X-ray sources with different focal spot sizes. | In contrast to [[brightness]], '''brilliance''' additionally takes the beam dimensions into account and is defined as brightness per mm<sup>2</sup>. The unit is p.p.s. <math>\times</math>mm<sup>2</sup> <math>\times</math>mrad<sup>2</sup>. Brilliance is maximized by making the beam size and divergence as small as possible, and the photon flux as large as possible. Two X-ray beams may have the same flux density but different brilliance if the two beams have different beam divergence. Brilliance is thus an appropriate parameter to use when comparing two X-ray sources with different focal spot sizes. |

## Revision as of 15:05, 26 September 2017

Brillance (*Fr*).

In contrast to brightness, **brilliance** additionally takes the beam dimensions into account and is defined as brightness per mm^{2}. The unit is p.p.s. [math]\times[/math]mm^{2} [math]\times[/math]mrad^{2}. Brilliance is maximized by making the beam size and divergence as small as possible, and the photon flux as large as possible. Two X-ray beams may have the same flux density but different brilliance if the two beams have different beam divergence. Brilliance is thus an appropriate parameter to use when comparing two X-ray sources with different focal spot sizes.