Abstract
Ultraviolet radiation may cause the skin damage. In order to protect skin from harm, it is necessary to know sky ultraviolet radiation. Until now, sky ultraviolet radiance distribution has been measured using mechanical scanning method. This has the problems that cloud condition may happen to change in a few minute during measuring. New measuring equipment for radiance distribution of sky erythema ultraviolet radiation was developed. It was an electronic scanning method and is equipped with 145 sensors of erythema ultraviolet radiation. Therefore, it has become possible to measure the radiance distribution at only three seconds. This research aims to measure erythema ultraviolet radiance distribution under broken cloud sky condition using this measuring equipment. As results, it was clarified ultraviolet radiation from broken cloud sky is sometimes higher than one from clear sky.
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