Patent ID: 7937227

Claim:
An evaluating method for evaluating an ultraviolet radiation protection effect in a measurement sample comprising: a first step of measuring a temporal change of a spectral transmission spectrum in the measurement sample within a predetermined wavelength range at predetermined wavelength intervals by irradiating the measurement sample with light including ultraviolet radiation from a light source under a predetermined light irradiating condition; a second step of setting a correlation between a light irradiating time and minimal erythema doses by predetermined time intervals, which minimal erythema doses are obtained by dividing minimal erythema doses of the measurement sample by a minimal erythema dose corresponding to 1 MED, based on the temporal change of the spectral transmission spectrum obtained in the first step; a third step of calculating a predicted in vitro SPF (Sun Protection Factor) in the measurement sample using a time until an accumulated minimal erythema dose that is obtained as a time integration of the minimal erythema doses based on the correlation obtained in the second step reaches 1 MED (Minimum Erythema Dose).