RADIANCE

Radiance

Radiance and spectral radiance are measures of the quantity of radiation that passes through or is emitted from a surface and falls within a given solid angle in a specified direction. They are used in radiometry to characterize diffuse emission and reflection of electromagnetic radiation. In astrophysics, radiance is also used to quantify emission of neutrinos and other particles. The SI unit of radiance is watts per steradian per square metre, while that of spectral radiance is or depending on whether the spectrum is a function of frequency or of wavelength.

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radiance

Noun

  1. the quality of being radiant, shining, bright or splendid
    Girt with omnipotence, with radiance crowned. — Milton.
  2. the flux of radiation emitted per unit solid angle in a given direction by a unit area of a source


The above text is a snippet from Wiktionary: radiance
and as such is available under the Creative Commons Attribution/Share-Alike License.

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