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Advantages and disadvantages of ultraviolet radiation
Advantages of ultraviolet radiation: 1) disinfection and sterilization; 2) Promote bone development; 3) Beneficial to blood color; 4) Occasionally, certain skin diseases can be treated;
5) It can promote mineral metabolism and the formation of vitamin D in the body.
Disadvantages of ultraviolet radiation: 1) Causes skin aging and wrinkles; 2) Produce spots; 3) Causing dermatitis; 4) Causing skin cancer.
Knowledge about UVC ultraviolet radiation
The sterilization principle of UVC
Among all wavelengths of ultraviolet radiation, only shortwave ultraviolet (UVC) has a bactericidal and disinfection effect, belonging to a pure physical disinfection method.
It has the characteristics of broad-spectrum efficiency, fast and thorough, no need to add chemical agents, no drug resistance, and no secondary pollution.
UVC ultraviolet radiation with a wavelength of 185nm can convert oxygen O2 in the air into ozone O3. Ozone has a strong oxidizing effect and can effectively kill bacteria,
but ultraviolet radiation with a wavelength of 185nm itself does not have a bactericidal and disinfection effect. The dispersibility of ozone can precisely compensate for the shortcomings of ultraviolet rays that can only propagate in a straight line and have blind spots in disinfection. It can reach any corner of space with air, making sterilization and disinfection more thorough.
The principle of ultraviolet sterilization: By irradiating microorganisms such as bacteria and viruses with ultraviolet light, the molecular structure of DNA (deoxyribonucleic acid)
or RNA (ribonucleic acid) in the microbial body cells is destroyed, causing DNA strand breakage, nucleic acid and protein cross-linking rupture, resulting in growth cell death
and regenerative cell death, achieving the effect of sterilization and disinfection. Among them, ultraviolet radiation with a wavelength of 253.7nm has the best sterilization and
disinfection effect.
Ozone sterilization principle: UVC ultraviolet radiation with a wavelength of 185nm can decompose oxygen and O2 molecules in the air, and the generated O atoms then
combine with O2 molecules to produce ozone O3. Ozone O3 has a strong oxidizing effect, which can destroy the cell wall of bacteria, penetrate into cells, and oxidize and
decompose glucose oxidase, ribonucleic acid (RNA), deoxyribonucleic acid (DNA), proteins, lipids, and polysaccharide macromolecular polymers, causing the metabolism and
reproduction process of bacteria to be disrupted and die, achieving the effect of sterilization and disinfection.
The sterilization characteristics of UVC
Efficient sterilization: The sterilization effect of ultraviolet radiation on bacteria and viruses is generally completed within a few seconds, almost instantaneous, and the
sterilization and disinfection ability is 600-3000 times greater than that of chlorine.
Broad-spectrum sterilization: UV technology has the highest broad-spectrum sterilization among all current disinfection technologies. It can efficiently kill almost all bacteria
and viruses.
More thorough sterilization: The combination of ultraviolet and ozone (UVC+O3) can exert a stronger and more thorough sterilization and disinfection power. Ultraviolet rays
directly irradiate the air and surface of objects to achieve strong sterilization and disinfection; Ozone permeates into every corner of the room with the air, completely killing
indoor bacteria.
Completely environmentally friendly: UV lamps emit ultraviolet radiation for sterilization and disinfection. The ultraviolet radiation generates ozone from the oxygen in the air,
which is strongly oxidized to kill bacteria and viruses. The entire sterilization process does not require the addition of any chemical agents, truly achieving complete environmental
protection.
There is no resistance to drugs: UV or ozone directly destroy DNA, RNA, proteins, etc. in bacterial and viral cells, causing cell death and inability to reproduce. There is no resistance
to drugs. However, sterilization with other chemical agents can cause bacterial and viral resistance, resulting in the ineffective sterilization effect of the chemical agent.
No secondary pollution: UV and ozone cause the direct death of bacteria and viruses, without the production of any other chemical pollutants; At the same time, ozone is converted
into oxygen within 15-30 minutes (half life of ozone) at room temperature, without any residual secondary pollution.
Sterilization efficiency of UVC
The bactericidal efficiency of UVC ultraviolet radiation on common bacteria and viruses (radiation intensity: 30000) μ W/cm2)
Preventing UVC ultraviolet rays from harming the human body
The main areas of harm caused by UVC ultraviolet radiation to the human body are the eyes and exposed skin. Short term high intensity radiation can burn the eyes and skin,
and long-term high intensity radiation can even cause skin cancer in severe cases.
UVC has extremely weak UV penetration, which can be completely blocked by ordinary transparent glass, clothing, plastic, dust, etc. Therefore, wearing glasses (if there are no
glasses, avoid looking directly at the UV light) and covering exposed skin with clothing as much as possible can protect the eyes and skin from the harm of UVC ultraviolet rays.
Short term exposure to ultraviolet radiation is like exposure to scorching sun, which is not harmful to the human body but beneficial. UVC ultraviolet radiation can promote
mineral metabolism and vitamin D formation in the body.
The principle of preventing UVC ultraviolet damage: 1) Wear glasses (ordinary glass or resin lenses are acceptable); 2) Avoid direct eye contact with UV lamps; 3) Wear long
sleeved clothing to cover exposed skin such as hands; 4) Use objects around you to block ultraviolet radiation, such as walls, furniture, curtains, books, newspapers, etc; 5) Avoid
prolonged exposure to ultraviolet radiation, as short-term exposure is not harmful to the human body.
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