In the electromagnetic spectrum, UV light comes between visible light region and X-rays. It has a shorter wavelength than visible range, and hence we cannot see it working with our eyes. A special blue light is added to indicate the device is radiating for safety.
UV Light is divided into three wavelength ranges: UV-A, UV-B, UV-C, to decrease wavelength. UV-C light has the shortest wavelength in the range of 200nm to 280 nm. Earth’s atmosphere doesn’t contain UV-C lights as the ozone layer blocks it.
The light with wavelengths between 200nm and 300nm is absorbed massively by the nucleic acids. The absorption results in misplacement and abbreviations in RNA or DNA of the cells. Essentially, destroying the DNA structure preventing replication of Cells or preventing and destroying nucleic acids and disrupting their DNA, resulting in inactivation of the organism, leaving them unable to perform vital functions. Microorganisms have less protection against UV radiation and cannot survive prolonged exposure to it. That is why UV-C light is also known as “germicidal UV.
The effectiveness of UVC depends on the amount of time, intensity, and exact wavelength of UV radiation a microorganism is exposed. Line-of-sight exposure of UV light is required to inactivate microorganisms. The presence of particles or obstacles to UV light can protect the microorganisms and help them withstand UV exposure. The use of highly reflective surfaces can increase the effectiveness and intensity of UV radiation.
UV lights are used in disinfecting water, air, and surfaces from bacteria, viruses, and other microorganisms. It is also useful in neutralizing “superbugs” which are resistant to antibiotics. UV-C effectiveness is measure in log reductions. A 6-log reduction is effective in deactivating 99.99% of bacteria. As some cells can repair its DNA damaged by UV light, this process is called base excision repair.
UV light irradiation safe and cost-effective way to sanitize masks and objects of daily use. If dose for the right length of time in a safe environment with the right amount of light intensity. Be sure not to be in direct contact with the UV light.