Abstract
The action spectrum for producing minimal phototoxic erythema after oral administration of 8-methoxypsoralen (8-MOP) was determined in the range of 312-368 nm in 12 human volunteers using six different UV radiation sources. The peak sensitivity was found to be at 343 nm. The 8-MOP photosensitivity was at a high level (> or = 0.75 of maximum) between 336 and 355 nm. Conventional UVA radiation sources, like the Philips TL/09R tube, have a high energy output within 335 and 355 nm, and are therefore highly recommended in oral psoralen plus UVA radiation treatment.
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