Essay On Sun Radiation

1965 Words8 Pages
As in everyday life, people used to protect themselves from injuries, but might ignore that sometimes, the invisible factor might also bring damage to human body. In daily time, it is very pleasant and warm when the day is sunny, and touch the sunshine. In some aspects, people could accept the benefits though enjoying sunshine, however, as people receiving the profits, the radiation which comes from the sun is also making negative influences to human body. The radiation might seemed to be intangible, but they might cause quite vital impacts to our health. As the sun radiation become a problem to human body, there are many ways to prevent it from happening. Sunscreen plays a quite significant role in the prevention of harm from sun radiation,…show more content…
Some of this damage is temporary, such as sunburn. However, it will lead to furture problems if allowing people’s skin to burn, for example, the skin cancer owing to long-term skin damage. UV radiation is part of the electromagnetic spectrum that reaches the earth from the sun. It has wavelengths shorter than visible light that make it invisible to people’s naked eye. These wavelengths can be classified as UVA, UVB and UVC. “UVA has the longest wave of 320-400 nanometers billionths of a memeter. It can be further divided into two wave ranges, UVA I, which measures 340-400 billionths of a meter, and UVA II which extends from 320-340 nanometers.” UVB ranges from 290 to 320nm. In the even shorter rays, most UVC is absorbed by the ozone layer and could not reach the earth. In an other word, the influences that sunshine could bring to human skin are caused mostly by UVA and UVB. UVA rays are able to penetrate deeper into human skin, damaging the dermis. The dermis contains elastic tissues which are used to keep the skin stretchy. UVA rays have negative effects to human skin due to it would lead the causing of wrinkles. UVB rays would contribute damage on epidermis. This would cause sun tanning on our

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