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radiance emitted by a surface, divided by that emitted by a black body at the same temperature as that surface, pinna kiiratav kiirgus, mis on jagatud selle pinnaga samal temperatuuril oleva musta keha kiirgusega
suundemissioonitegur . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/suundemissioonitegur/1/est (04.08.2026)