Radiant Intensity
Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a directional quantity. [Wikipedia: https://en.wikipedia.org/wiki/Radiant_intensity]
Radiology
QUDT
http://qudt.org/schema/qudt#RadiantIntensityUnit
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.