![]() (In scientific terms, 1 mWs/cm 2 =1 mJ/cm 2). Irradiance is measured in milliwatts (mW) per square centimeter (cm 2), and the dose of UVC is measured in millijoules (mJ) per square centimeter (cm 2) of the object being irradiated. The dose is a function of the UVC intensity or "irradiance" from a specific distance from the object times the number of seconds the object is exposed. In order to be effective, the right "dose" of UVC must be applied. Of the three main types of UV light, UVC (which has a wavelength range of 200 to 280 nm) is the most effective for inactivating viruses, with the most effect wavelength being about 260 nm ( Lytle, J Virol 2005). UV radiation kills viruses and bacteria by damaging their genetic material (DNA and RNA). ![]() ![]() Further below are our reviews and comparisons of UVC products marketed to consumers. If you are still interested in using UV light to help protect yourself from coronavirus, here are the things you'll need to know. Masks can be more easily disinfected other ways, such as in a washing machine (for cloth masks) or at low temperature in an oven (for N95 masks). Many UV products marketed as "killing 99.9% of germs" may be so weak that you would need to hold them for an hour at different angles just to disinfect a mask. Think of using UV-C light to disinfect an object like using a hair blower to dry an object - it can take a lot of time, but with UV-C you often won't know when you're done. UVC works fastest and most reliably on non-porous surfaces, but it may be easier and faster, as well as safer, to clean such surfaces with liquid disinfectants. The big challenge with using UV-C light is being sure your UV lamp provides a large enough dose of UVC light to all the surfaces you need to disinfect, such as a mask, phone, or an entire room, and that you are not exposed to the UVC light, as it is dangerous. Also, more research is needed to test UVC on various household surfaces, and to determine how effective consumer products may be when used in the home, rather than under laboratory conditions. Yes, ultraviolet light in the "C" range, also known as UVC, has been shown to kill SARS-CoV-2, the virus that causes COVID-19, although these devices may take a long time and be less effective than other disinfectants.
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