Ultraviolet germicidal irradiation is a safe and highly effective method for disinfecting the air, thereby preventing transmission of a variety of airborne infections. UVGI is most effective in preventing infections spread chiefly by droplet nuclei, not by direct contact or larger respiratory droplets, although some surface decontamination likely occurs. The wavelength of this light ranges from 10nm to 400nm and is classified into three sub-bands; UV-A (near), UV-B (middle), and UV-C (far). UV light with wavelengths less than 290nm are considered to have “germicidal” properties.
The effectiveness of this UV irradiation depends on the length of time a microorganism is exposed to UV, as well as the intensity and wavelength of the light emitted. Large-scale commercial sterilizers along with HVAC systems are installed in industrial, health care areas to requiring UV circulation and sterilization in greater proportions. This combination also helps in air purification and also removal of Volatile Organic Compounds (VOCs).
UV-C light is hazardous to humans and can cause health problems which include blindness, cancer, etc. The Threshold Limit Value (TLV) of exposure must be adhered to by all persons who are regularly coming in contact with the Ultra Violet Radiation. For 254 nm UV, this TLV is 6 mJ/cm 2 over an eight-hour period. Hazmat suits offer protection from the harmful radiation exposure depending upon the material used for their fabrication. These suits offer protection from head to toe and can be reused to certain period as indicated by the manufacturer.
