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What is the difference between UVB and UVA?
Type:Uv phototherapy Time:2016-08-02 11:01:27 Ultraviolet rays can be divided into 3 types--- UVA, UVB, and UVC. The ozone prevents anyUVC from reaching the earth¡¯s surface. Both UVA and UVB are invisible and UVB also helps
our bodies form Vitamin D.
UVB is the type of sunray that usually causes sunburn (¡°B¡± for burn) and is associated with
skin cancer development and photoaging. UVB penetrates clouds, but does not penetrate
window glass. UVB can be effective in the treatment of psoriasis and other skin disorders.
UVA is the type of sunray that is highly correlated with photoaging (¡°A¡± for aging) and skin
cancer development and is the ray used in tanning salons. By itself, UVA is not as helpful at
clearing psoriasis as UVB alone, but UVA combined with psoralen is highly effective. UVA rays
can penetrate both window glass and clouds.
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