Disinfection by UVC radiation?

31/08/2020

Each of us has certainly encountered the term UVC in our lives. However, it is not long before the possibility of disinfection is associated with this term. Does it really work?

UVC radiation is otherwise called germicidal radiation. To be precise, when we observe the spectrum of solar radiation, we find that it contains approximately 1% of UV radiation. Germicidal radiation belongs to the area of UV-C radiation. The wavelengths are measured in nm and the UV range is between 13.6 and 400 nm. The longest wavelengths of UV radiation extend to the area of visible light. UV - radiation moves in a straight line, its intensity decreases with the square of the distance. It does not penetrate into fabrics, does not pass through ordinary glass and acts only where it falls.

From the point of view of air sterilization, radiation in the range of 280 to 200 nm is the most interesting. UV radiation of this wavelength disrupts and destroys the ribonucleic acids that are the carriers of information in cells. There are changes in the plasma of cells and in the nucleus. Cell division is inhibited and completely stopped at a certain dose of UV radiation. Wavelengths below 290 nm can no longer be found on the earth's surface. The upper atmosphere does not transmit UV radiation with a wavelength below 290 nm.

Depending on the method of use, we distinguish between direct and indirect irradiation.

Direct or germicidal radiators without the presence of humans are generally used to effectively disinfect air that contains the entire volume of air. Other types of radiators are used in humid and dusty environments at the same time. It is a process of the direct impact of radiation on the surface of objects, while the destruction of germs in the air and on the surface. Disinfection occurs at the moment of UVC radiation exposure to microorganisms, which die rapidly due to the disruption of cell structures. It is ultraviolet radiation of wavelength 253.7 nm.

Indirect or germicidal emitters in the presence of humans represent the continuous purification of the air by forcing the air around the tubes at close range, resulting in extremely short exposure time. No chemicals are used. These germicidal emitters disinfect the air from microorganisms such as bacteria, viruses and protozoa, causing photochemical decomposition of their DNA. Enclosed radiators have a source of UV radiation housed in a tunnel through which air passes. Contaminated air enters the device from below and exits from the top, which ensures air circulation in the room. For this reason, they have found application mainly in households, schools and offices.

The question we should ask at the end is: is UVC disinfection radiation safe? It is, but it depends on what doses we are exposed to. UVC radiation, even in small doses, can have a negative effect on the human body - both in intensity and duration of action. Children 's skin and eyes, in particular, are particularly sensitive to the effects of UVC radiation. Therefore, it is necessary to use protective equipment - e.g. tight-fitting glass goggles and rubber gloves and not to expose the body to excessive direct radiation, in children only reflected radiation from walls or ceilings is permissible.

We are constantly working to bring new, innovative products. For this reason, we are also working on such products which, in addition to "anti-water" protection, will also have disinfecting capabilities - precisely on the principle of UVC radiation. Of course, to a completely safe extent. This means that (among other things) you will have two different protections everywhere. Doesn't that sound great? 😉🙂