minimal erythema dose

actinic dose, using the erythema action spectrum, that produces a just noticeable erythema on a single individual's previously unexposed skin

Unit: J·m-2

NOTE This is a subjective measure based on the reddening of the skin; it depends on many variables, e.g. individual sensitivity to UVR, radiometric characteristics of the source, skin pigmentation, anatomic site, elapsed time between irradiation and observing the reddening (typical value: 24 h), etc. Since it varies with each individual, it should be reserved solely for observational studies in humans and other animals.

See also “standard erythema dose (SED)

Abbreviation: “MED”

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