Abstract
The necessary condition of stationarity in radiators with scattering media is deduced. It is obtained from the fact that all primary emitted radiation disappears with probability unity when radiation is time-independent. The disappearance due to the absorption by matter and to escape from radiator is taken into account. The condition of stationarity includes the characteristics of radiation polarization, the coefficients of medium absorption, and the elements of the Green's function matrix. The relations between intensity components of radiation are derived from the condition. The results may be used in investigations of various radiators with scattering media.
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