steradiancy

Noun

 * 1) The rate of radiation transfer from a surface for each steradian of solid angle in a specified direction per unit area of cross section of the radiation perpendicular to that direction
 * 2) * 1959, United States. National Aeronautics and Space Administration, NASA Technical Note (issues 3641-3650, page 15)
 * The geometry of the cone θ and the irradiance at the image of the carbon block were used to determine the absolute steradiancy of the energy in the cone θ as a radiometer calibration value.
 * The geometry of the cone θ and the irradiance at the image of the carbon block were used to determine the absolute steradiancy of the energy in the cone θ as a radiometer calibration value.