Beware of ultraviolet rays

Many scientific and medical studies have demonstrated the danger of UV exposure too long or too frequent, especially unattended. But what ultraviolet rays? It is electromagnetic radiation (solar or artificial) with a wavelength of between that of light and X-rays At length shorter, more action is strong.

There are UV-A (longer length), UV-B and extreme UV (UV-C). A clarification: this is light and not heat (due to infrared). At the surface, on which it operates is close to the sun, at least the ozone layer can intercept UV. Similarly, if the surface is reflective to light, UV rays are strongest. Thus, they are most active between 11 am and 16 am and at high altitude. They are reflected by water (5%), sand (20%), grass (5%) and snow (85%). Sunburn is primarily due to UV-B (shorter length) but UV-A can also result in prolonged exposure. UV-B are very dangerous to the eyes can cause cataracts and even blindness in the long term. They cause skin aging. As against, UV-A penetrates the skin more deeply, which is no less disturbing. UV-B and UV-A can cause skin cancers such as melanoma, but also carcinoma. To defend these attacks, the body releases melanin, originally tan is therefore a means of defense and not just a pretty color aesthetic.

At the beach, but also in booths, UV is not recommended by dermatologists. A study conducted by the Ministry of Health shows that it is truly a public health problem and the National Academy of Medicine has requested that all tanning facilities are checked but no legislation is really implemented. In addition, some drugs taken may be in contradiction with the receipt of UV. So, seem like fit, beautiful, tanned yes … Become ill, no!