Radiance In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiation, or to quantify emission of neutrinos and other particles. This is a directional quantity. Historically, radiance is called "intensity" and spectral radiance is called "specific intensity". [Wikipedia: https://en.wikipedia.org/wiki/Radiance] Radiology QUDT http://qudt.org/schema/qudt#RadianceUnit ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents.