radiant exposure (at a point of a surface, for a given duration) [He]

1. quotient of the radiant energy, dQe, incident on an element of the surface containing the point over the given duration, by the area, dA, of that element

2. equivalent definition: time integral of the irradiance, Ee, at the given point, over the given duration, Δt


Unit: J·m-2 = W·s·m-2

NOTE The quantity “exposure” here defined must not be confused with the quantity also named “exposure” which is used in the field of X- and γ-rays, the unit of which is coulomb per kilogram (C·kg-1).

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