Sunday, April 19, 2020

UV-C disinfection of hospital rooms

Electromagnetic spectrum - Stanford University
UV-C light in the range of 280 to 200 nm (254 nm the most effective) is a disinfectant used in laboratories and ventilation systems. Direct exposure to the light at this wavelength can severely damage skin and damage vision. UV light can also produce ozone, Ozone health effects are noted by the CDC.

The following links describe the use of UV-C lights for room disinfection.  One of the concerns is making sure that the light exposes all surfaces.  There are also concerns about the length of time needed.  The light does generate heat so no flammable objects can be close to the light. The UV-C light will decay in effectiveness over time. Specific meters are used in the UV-C light range to determine the level of exposure needed to kill the virus. Refer to the Wikipedia article on Ultraviolet Germicidal irradiation

Links:

CDC methods of disinfection  UVC kills bacteria and viruses more easily than bacterial spores.

Research Gate: inactivation of mold spores by UVC Aspergillus niger conidia are difficult to kill with UV-C light

Science Direct -Programmable and low cost UV-C room disinfection

NIH - Using UV-C light to disinfect high touch surfaces in hospitals.

Asian Journal - UVC kills bugs at home.

Indian J. of Med. and Biology - Surface disinfection by germicidal UV-C light


Dangers of UV-C light - 4 minutes



Applications of UV-C disinfection - BBC News - 2 min.



Duke Health: Benefits of room UV-C disinfection - 2 min.

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