Sunlight is made up of harmful UV radiations of different wavelengths. Long wavelength radiations comprise the UVA rays (320-400nm) while short wavelength radiations comprise the UVB radiations (290-320nm). UVA rays account for 90 to 95% of UV radiation that reaches the earth. While UVB makes up only 5-10% of solar radiation, its high energy damages surface epidermal layers and causes sunburn. UVA rays penetrate deep into the dermis and primarily cause skin aging. Both radiations however can cause skin cancer. By damaging the skin's cellular DNA, excessive UV radiation produces genetic mutations that can lead to skin cancer.
How to Apply SunscreenThe amount of sunscreen applied is directly proportional to the amount of solar radiation absorbed. In other words, more sunscreen results in less solar energy absorption. Since sunscreens may wear off and become less effective with time, the frequency with which they are reapplied has a direct implication to limiting absorption of solar radiation. The reapplication frequency is also influenced by the various activities that one may be involved in. For example, while swimming the probability of sunscreen application may be more frequent because water may wash the sunscreen from the body. High levels of physical activity require more frequent reapplication because the activity may physically rub off the sunscreen and heavy sweating may wash off the sunscreen. It is thus necessary that more frequent reapplication be followed to decrease absorption of solar radiation.
At this time of the year, when the summer sun is scorching above us, it is essential to protect our skin from the hazardous effects of UV rays. Take time and take care.Disclaimer:
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