| density of incident radiant energy with respect to area at a point on a real or imaginary surface where Qe is radiant energy and A is the area on which the radiant energy is incident Note 1 to entry: The quantity "radiant exposure" defined here must not be confused with the quantity named "exposure" which is used in the field of X- and γ-rays, the unit of which is coulomb per kilogram (C·kg−1). Note 2 to entry: The corresponding photometric quantity is "luminous exposure". The corresponding quantity for photons is "photon exposure". Note 3 to entry: The radiant exposure is expressed in joule per square metre (J·m−2 = W·s·m−2). Note 4 to entry: This entry was numbered 845-01-42 in IEC 60050-845:1987.
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