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countable and uncountable, plural steradiancies
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 quotations examples
Such sources usually attain brilliance by high current densities in small volumes. The total energy output may therefore be less than a greatly extended source of low steradiancy.
1954, Alexander Hollaender, Radiation Biology: Ultraviolet and related radiations, page 123
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.
1959, United States. National Aeronautics and Space Administration, NASA Technical Note (issues 3641-3650, page 15)
[…] steradiancies seen by the instrument during calibration were between 45 and 55 percent higher than the calculated average steradiancies […]
1966, Project Fire Flight 1 Radiative Heating Experiment, page 29