UV-B Radiation Exposure and the Effect in the Change of Color at Winter time Ski Ground and Summer time Beach Side.

概要

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The intensity of UV-B radiation corresponding to erythema action spectrum was measured at each outer position of the human body standing on the sand of the seaside beach in summer, and on the snow at skiing ground in winter, using a portable model of the UV-B radiometer designed to match its spectral response function to the erythma action spectrum. On the sand, the intensity at the headtop, shoulder and forehead was high in this order. on the other hand at the skiing ground, the forehead and breast received the higer level of the UV-B radiation compared to the headtop, and even at the cheek and chin some apreciable amount of the UV-B was detected, showing that the reflection of the UV-B was much higher on thesnow than on the beach sand. The UV-B intensity at the central Tokyo was nerely same as on the beach when measured in the same month, which suggest the necesity of good care against to the radiation even in the city. The results of the three hour sunlight irradiation experiment to the human skin both of the beach and at the skiing ground show that the skin portion with SPF 28 cosmetics had no visual color change, although a portion without any sunproof cosmetics got appearent sunburn. The skin color recovering speed from sunburn of each moniter was remarkably different from each other.
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