17-402

erythemal dose [Her]

time integral of erythemal irradiance defined by the equation:

        

where Eλ(t) is the spectral irradiance in W⋅m-2⋅nm-1 and ser(λ) is the erythema action spectrum normalized to 1 at its maximum

Unit: J⋅m-2

Equivalent term: "erythemal radiant exposure"

See also "minimal erythema dose", "standard erythema dose"

NOTE This definition implies that an action spectrum is adopted for the actinic effect considered, and that its maximum value is 1. When giving a quantitative amount, it is essential to specify according to which actinic action spectrum the dose is meant, as the unit is the same.

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