There are various types of radiation, but the best known is the Ultraviolette .
I IR rays are very penetrating rays, cause heating cell and vasodilation, but they are rarely harmful. At most heat stroke causing .
I Visible rays are very penetrating, but well tolerated by the body. It also partly reflected by the stratum corneum.
I UVA cause reddening of the skin, but do not tan. The energy released by this type of radiation is not sufficient to start the production of melanin by the body, so the person can not tan. UVA, however, are dangerous because they have enough energy to cause changes in the structure of the skin . This type of radiation is able to penetrate the inner layers of the skin and exert deleterious effects. They can then make changes in the collagen and of ' elastin, which are the two main protein of the dermis, giving skin dry and wrinkled. But they can also give rise to some cancers. It 'so good protect yourself with sun protection containing UVA and UVB rays as well.
I UVB instead possess sufficient energy to begin the process of melanogenesis and kick off the production of melanin, responsible for the change in skin color, and then of 'tan . The radiation causes un'ispessimento wall dermis, long (about 5-6 days). This type of rays are responsible for ' sunburn, skin alteration similar to sunburn and characterized by redness, swelling, diffuse, and fever blisters. The rash appears after 10 hours of exposure and reaches its peak after 100 hours.
I UVC rays have more energy for other forms of radiation. May result in irreparable damage to the skin very quickly. These rays are shielded from ozone in the atmosphere.
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