What exposure measurement is defined as intensity multiplied by time exposed?

Total exposure is defined as the product of intensity and duration of exposure. In the context of UV radiation, this means that total exposure quantifies the amount of UV light a person is subjected to by considering both how strong the UV light is (intensity) and how long the exposure lasts (time exposed). This measurement is critical in evaluating the potential effects on the skin, such as risk of sunburn or tanning, as well as in understanding safe tanning practices.

Sunlight duration alone refers to the length of time the sun is shining but does not take into account the strength of the UV rays during that time. Tanning effect relates to the physiological changes in the skin as a result of UV exposure, which is not a direct measurement but rather an outcome. UV intensity measures the strength of the ultraviolet light at a given moment but does not incorporate the time factor. Therefore, total exposure is the most comprehensive measure as it combines both elements into a single indicator of risk or effect.