THE EFFECT OF APPLIED THICKNESS ON SUNSCREEN PROTECTION: IN VIVO AND IN VITRO STUDIES |
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| Authors: | S. Brown B. L. Diffey |
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| Affiliation: | Departments of Pharmacy, Durham, UK;Medical Physics. Dryburn Hospital, Durham, UK |
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| Abstract: | The effect of applied thickness of sunscreen on the degree of protection against ultraviolet exposure has been investigated using an in vitro model (excised human epidermis) and phototesting in human subjects. The agreement between the protection factors obtained by each technique was excellent. It is shown that the influence of applied thickness on sunscreen protection factors is much less than would be predicted by Beer's law. |
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