# 17-26-068

minimal erythema dose

MED

actinic dose, using the erythema spectral weighting function, that produces a just noticeable actinic erythema on a single individual's previously unexposed skin

Note 1 to entry: The minimal erythema dose is a subjective measure based on the reddening of the skin; it depends on many variables, e.g. individual sensitivity to ultraviolet radiation, radiometric characteristics of the source, skin pigmentation, anatomic site, elapsed time between irradiation and observation of the reddening (typical value: 24 h). Since the minimal erythema dose varies with each individual, the use of this quantity should be reserved solely for observational studies in humans and other animals.