Which of the following ultra-violet radiation cause most skin disorder-
Correct Answer: UV-B
Description: Cutaneous responses to uv radiation UVA -315-400nm immediate erythema Immediate pigment darkening- merowsky phenomenon drug induced photosensitivity photoageing UVB- 280-315nm 1000x more erythmogenic, associated with sunburn delayed melanogenogenesis major role in carcinogenesis role in photoageing role in vitamin d synthesis UVB has more damage to skin fitzpatrick textbook of dermatology page 267
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