FAQ
What is germicidal UV, and what is UVGI?
Germicidal UV (GUV) refers to using ultraviolet radiant energy to inactivate bacteria, mold spores, fungi or viruses. When the process is applied in a given location, it has generally been referred to as ultraviolet germicidal irradiation (UVGI).
Because of the public’s concern about ionizing radiation (e.g., X-rays and gamma rays), the term GUV avoids needless concerns about a link with that type of radiation. Another non-technical term is germicidal light, although “light” is technically only visible radiation.
Can UV-C kill viruses as well as bacteria?
Yes, UV-C kills living bacteria, but viruses are technically not living organisms; thus, we should correctly say “inactivate viruses.” Individual, energetic UV-C photons photochemically interact with the RNA and DNA molecules in a virus or bacterium to render these microbes non-infectious. This all happens on the microscopic level. Viruses are less than one micrometer (µm, one-millionth of a meter) in size, and bacteria are typically 0.5 to 5 µm.
Can UV-C effectively inactivate the SARS-CoV-2 virus, responsible for COVID-19?
Yes, if the virus is directly illuminated by UVC at the effective dose level. UVC can play an effective role
with other methods of disinfection, but it is essential that individuals be protected to prevent UV
hazards to the eyes and skin and should not be used to disinfect hands
