Development of ultraviolet-ray sensor.
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概要
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A disposable ultraviolet sensor has been developed, which provides a convenient way of measuring the irradiated dose of UV-rays without a particularly skilled technique.The ultraviolet sensor consists of a first rayer comprising a photo activator forming a free radical by irradiation of UV-rays and a discoloring agent exhibiting a color change in visible range of spectrum through the action of this free radical, a second layer comprising a ultraviolet absorber, and a third transparent protective layer on a support.The color of the ultraviolet sensor changes corresponding to the irradiated dose of UV-rays and the discoloration has high sensibilities to only ultraviolet range of spectrum. And the ultraviolet sensor is waterproof and stable at 0°C to 50°C under light shielding.Next, using the ultraviolet sensor, the irradiated dose of UV-rays on vertical plane to the ground has been investigated under several environmental conditions. As man's face locates almostvertically to the ground, the irradiated dose of UV-rays on a face seems to be almost equal to that on vertical plane to the ground.The irradiated dose of UV-rays on vertical plane to the ground under ground conditions (namely reflective surface) such as soil, turf, asphalt and concrete was about 30% of that on horizontal plane at noon when the sun's altitude was high, and was about 45% in the middle afternoon when the sun's altitude was relatively low. And on the surface of snow the abovementioned value was 72%, which was very large.Furthermore, the ultraviolet sensor has enabled us to evaluate a ultraviolet absorber in high concentration (practically used in cosmetics) by measuring the transmitted dose of UV-rays.Using a SE lamp as a UVB light source and a BLB lamp as a UVA light source, extinction coefficients of two ultraviolet absorbers, Parsol A and Escalol 507, have been investigated. Extinction coefficients in ethanol (E0.01%1mm) of Parsol A were 0.30 (SE lamp) and 0.76 (BLB lamp), and those of Escalol 507 were 0.46 (SE lamp) and 0.13 (BLB lamp) respectively.These results demonstrated that Parsol A showed a much superior UVA protection effect to that of thc conventional Escalol 507. Usually an ultraviolet absorber evaluates by its absorbance measured in its dilute solution without intermolecular interaction (usually 10ppm), but these results also suggested a possibility of an ultraviolet absorber's showing an enough UV protection in high concentration practically used in cosmetics, although it had a relatively small absorbance in its dilute solution.
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