Introduction
Ultraviolet light which is responsible for sunburn,
suntan and increases the risk of basal cell carcinoma
and malignant melanoma. Different radiation are of
UVA in the 320-400, UVB-290-320 and UVC- 100-
290 nm range respectively. Exposure to solar radiation
is recognized to have negative effects on the human
skin. UVA rays can be divided into two key
wavelengths: short-wave UVA (320 - 340 nm) and
long-wave UVA (340 - 400 nm). Ultraviolet radiation
A and B (UVA, UVB) are especially harmful by
different mechanisms that result in suppression of
skin’s immune system. This immunosuppressive effect
generates photodermatoses, skin premature aging and
skin cancers. The Sun Protection Factor (SPF)
measures the length of time a product protects against
skin reddening (sunburn) from UVB (Ultra Violet)
radiation, compared to how long it takes to redden
without protection. To maintain the SPF, reapply
sunscreen every two or four hours and right after
swimming or sweating 1.
Introduction
Ultraviolet light which is responsible for sunburn,
suntan and increases the risk of basal cell carcinoma
and malignant melanoma. Different radiation are of
UVA in the 320-400, UVB-290-320 and UVC- 100-
290 nm range respectively. Exposure to solar radiation
is recognized to have negative effects on the human
skin. UVA rays can be divided into two key
wavelengths: short-wave UVA (320 - 340 nm) and
long-wave UVA (340 - 400 nm). Ultraviolet radiation
A and B (UVA, UVB) are especially harmful by
different mechanisms that result in suppression of
skin’s immune system. This immunosuppressive effect
generates photodermatoses, skin premature aging and
skin cancers. The Sun Protection Factor (SPF)
measures the length of time a product protects against
skin reddening (sunburn) from UVB (Ultra Violet)
radiation, compared to how long it takes to redden
without protection. To maintain the SPF, reapply
sunscreen every two or four hours and right after
swimming or sweating 1.
การแปล กรุณารอสักครู่..
