Guanghan Longrun Science and Trade Technology Trade Co., Ltd. , https://www.kairungongju.com
1. X-ray is harmful to human body.
In order to protect the operating physician from damage, the walls of the x-ray room in the hospital are made of thick lead plates.
2. Ultraviolet
(a) A certain amount of ultraviolet radiation can affect skin blood circulation and promote some beneficial biological effects.
(b) High-energy ultraviolet radiation can damage the structure of the DNA in the bacteria, causing the bacteria to swiftly die. According to this, it can be used for sterilization and sterilization, with high sterilization efficiency, usually more than 10 seconds to complete drinking water sterilization. If the chlorination method is used, it takes half an hour to add foreign substances and change the taste of the water.
Of course, high-energy ultraviolet light will also damage the structure of the DNA molecules in the human body and damage the carotene, a useful anti-cancer substance in the body. From the late 1970s to the early 1980s, sunbathing was popular in the West. But medical experts advise that all sunbathing is risky. Ultraviolet damage to the human body is particularly manifested in the increased incidence of skin cancer and leading to cataracts and even blindness.
(c) At an altitude of 20-40km above the ground, there is an ozone (o3) layer, which can absorb 95% of the ultraviolet radiation radiated by the sun to the ground and maintain the growth of all things on the earth. It is known as "the maintenance umbrella of humanity". However, due to the many applications of Freon, etc., in 1984, the ozone layer was found to be empty above Antarctica. Blind fish and blind sheep were presented in Chilean waters. At the end of 1999, the Chinese government officially released a national plan for the gradual screening of ozone-depleting substances. To avoid damage, please do not walk under the scorching sun.
3. Infrared radiation
Infrared radiation, commonly known as infrared, is electromagnetic radiation with a wavelength between 0.75 and 100 microns that is invisible to the human eye. Its skills are one of the important pillars of military and industry, for example, infrared tracking, guidance, alarm, aerospace remote sensing, identification of pretend, night vision, etc. We see a rich and clear cloud image on the TV screen, which was sent back by the "Feng-1" (FY-1C) polar-orbiting meteorological satellite launched by China. Its key skill is the infrared detection system. Others, such as optical fiber communication, automatic control, heating and baking. In the meantime, infrared fiber optic cables are more likely to replace satellite microwave communications.