| Definition: | ideal thermal radiator that absorbs completely all incident radiation, whatever the wavelength, the direction of incidence or the polarization Note 1 to entry: A Planckian radiator has, for any wavelength and any direction, the maximum spectral distribution of radiance for a thermal radiator in thermal equilibrium at a given temperature. Note 2 to entry: This entry was numbered 845-04-04 in IEC 60050-845:1987.
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