UVA
Sunlight always reaches the earth in the form of radiation, consisting of a series of electromagnetic waves with different wavelengths. Ultraviolet waves with a wavelength of 100 to 400 nanometers are one of these electrical waves of sunlight, of which 100 to 280 nanometers are named UVA and are among the most dangerous types of ultraviolet that can be repelled by the ozone layer. Of course, this is also possible as long as the ozone layer is not thin and perforated by factors such as destructive substances or weather conditions, etc., because today in Australia, due to the perforation of the ozone layer and the entry of this group of ultraviolet radiation wavelengths into the earth, we are witnessing an increasing prevalence of skin cancer.
UVB
UVB refers to ultraviolet rays with wavelengths of 280 to 320 nanometers, of which only 10 percent are capable of penetrating the ozone layer and reaching the earth. Prolonged exposure to it will cause skin burns, and in fact, people at sea use this radiation to tan their skin.
UV Index
Given that 100 percent of the extremely dangerous ultraviolet radiation with a wavelength of 320 to 400 nanometers reaches the earth, scientists have recorded an index called the UV Index, which is related to UVA, in order to protect human health. This index is defined from one to 11 depending on its intensity and frequency. By knowing the intensity of the radiation, you can take the best care and protection for your skin.
The UV index is divided into 5 categories depending on the severity of the sun’s ultraviolet rays:
Types of UVA indicators
• Range 0 to 2: If the Meteorological Organization and the State Ecosystem of UVs declare between 1 and 2, it is safe and you will not need any special protection when placed under this radiation.
• Range 3 to 5: If the UV index is in this area, the risk of this medium will be and the necessary measures before you are positioned under this radiation will be the use of sunscreen with SPF 10 to 15.
• range 6 to 7: If the UV number is between 6 and 7, the risk of this frequency is high. Since exposure to this radiation can disrupt the immune system and cause safe diseases of self, so people with safe diseases such as diabetes, allergies, MS, etc., etc. They should not leave their home when the UV index of their city is between 6 and 8. Other people should, at least as far as possible at the peak hours of sunlight between 10am and 16pm, refrain from being exposed to long -term exposure to UV, and if necessary, not only should the wide -edged hats should be. Wear long -sleeved dresses, sunglasses, gloves and sunscreen with SPF 30, but should replace and renew their sunscreen every two hours due to the rapid loss of the effect of sunscreen.
• Range 8-10: areas where UVs are diagnosed between 8 and 10, the risk of sunlight is very high and unfortunately, given that the amount of penetration of this radiation is very deep, if it is not used, if it is not used. Sunglasses with UV 400 protectors can witness diseases such as cataracts, immune system disorder or skin cancer, and no difference you have been under sunlight at the peak of sunlight (10 to 16) or in the sunlight. The car, however, has a destructive effect of 6 months exposed to sunlight.
• Over 11: When the World Meteorological Organization of any country declares the index 11, it means that the risk of exposure to sunlight is very severe, so the area is to restrict traffic and prevent diseases such as water. Pearls, immune system disorder, etc. formal holidays will apply for several days until this problem is resolved. It is interesting to know that in such situations that the UV index has been identified as number 11, despite all safety recommendations such as using suitable sunscreen, hats, sunglasses, etc. and short -term half -hour placement for up to 40 minutes below Sunlight, with its wavelength of 320 to 400 nm, is able to enter the body’s inner tissue and cause DNA modifiers to lead to concentrate, cataracts and immune system disorder.
