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which uv rays cause more damage ? a or b?
so far as i recall it is b? right?
cos' not very sure


There is a question in USMLE Q-bank...So, I just looked at my are right.
There are UVB (290-320 nm wavelength)- sunburn, immunosupression, ca, skin aging and UVA(320-400) contribute a little for sunburn, there are UVA1 and UVA2.
The question was about sun screen. For UVB- PABA esters, for UVA- avobenzone, for both- use Zn-containing



thnx sigh


FYI, if I recall correctly:

UVC is the worst of all -- but Ozone blocks it out

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