What harm does ultraviolet ray have to human body?
Excessive exposure to sunlight can cause damage to the body's skin, eyes, and the immune system. Ultraviolet radiation can damage human skin cells, resulting in wrinkles, pigmentation, skin dermatitis and prematurely senile, produce serious sunburn, skin and mucosa or actinic keratosis, cause cancer. The eye is a sensitive organ of ultraviolet light, which can cause damage to the lens. It is one of the pathogenic factors of senile cataract.
Ultraviolet radiation is a general term for radiation from 0.01 - 0.40 microns in electromagnetic spectrum. The shorter the wavelength of ultraviolet light, the greater the danger to human skin. Short wave ultraviolet light can pass through the dermis, while medium wave can enter the dermis. In hot summer days, the ultraviolet rays of the sun's rays are difficult to avoid.
In the scorching summer morning, 10 am to 3 pm, the strongest intensity of ultraviolet radiation in the sun, outdoor activities should avoid this period of time, in order to avoid ultraviolet harm to the human body, even in this period of time in outdoor activities, also do not forget to hold sunshade, wear a hat or sunglasses, use the regular manufacturers the skin cream and sunscreen, and as a white or light colored clothes, in order to reduce the ultraviolet radiation, causing unnecessary damage to the human body. Although excessive UV damage to humans, but the healthy growth of the body can not be separated from ultraviolet light. Vitamin D3 can be converted into vitamin D3 by light irradiation, and vitamin 7- plays an important physiological role in maintaining calcium concentration and regulating calcium and phosphorus metabolism in human cells. In sunshine is insufficient, and the incidence of osteoporosis of infant rickets and osteomalacia in adults, babies thrive cannot do without adequate sunlight, the body needs proper UV, therefore, the amount of light is necessary.
