self-exchange coefficient (of a surface when its radiance or luminance is the same at all points and for all directions) [gs]

quotient of that part of the radiant flux or luminous flux from the surface which falls on the surface itself, by the radiant exitance or luminous exitance of the surface

Unit: m2

NOTE The self-exchange coefficient of a surface, S, limited by a flat curve, C, and situated on only one side of the plane of this curve is equal to the surface area of S minus the flat surface area limited by C.

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