Ultraviolet lamps are widely used in phototherapy, and positive health effect of UV
irradiation is associated with the synthesis of vitamin D in human skin. Nevertheless, to avoid
harmful effects of UV radiation a variety of commonly used broadband UV detectors have an output
in erythema units. Therefore the measurement of the vitamin-D-synthetic capacity is a missing link
in the metrology of UV lamps that are used for medical and/or cosmetic purposes. This paper
presents original UV measuring device based on the same photoreaction in vitro by which vitamin D
is synthesized in human skin via photo- and thermo- induced conversions of 7-Dehydrocholesterol
(provitamin D3). Thus the targets for UV photons are provitamin D molecules embedded in
specially designed UV transparent and stable matrix mimicking biological samples. Three
operation modes of varying complexity are developed to follow the photoreaction course in real
time.
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