The principle of ultraviolet disinfection lamp is as follows:

Ultraviolet rays mainly act on the DNA of microorganisms. By destroying the DNA structure, they lose their functions of reproduction and self-replication, and they can also destroy the microorganisms in the air. Oxygen ionization produces ozone with bactericidal effect, thereby achieving the purpose of disinfection. Irradiation methods include: conventional irradiation, close-range high-intensity irradiation, and in-box irradiation.

The limitation of ultraviolet disinfection is that it can only be used to disinfect indoor air when no one is around. Doors and windows need to be closed during disinfection. After irradiation, the room should be ventilated. At this time, the disinfection status of the indoor air will be affected. It is gradually destroyed and will return to its original state after about 20 minutes. Therefore, ultraviolet disinfection is more suitable for disinfection of indoor air before aseptic operations and terminal disinfection of infectious diseases.

Ultraviolet lamp usage registration

The irradiation intensity of ultraviolet rays will gradually attenuate as the use time increases. That is to say: the longer the cumulative exposure time, the lower the irradiation intensity of the lamp. The lower it is, the disinfection effect will also decrease. UV manufacturers will also give the effective life of the lamp in the product manual. Therefore, registering it for daily use is also an effective monitoring of the UV lamp.

Routine registration contents include: disinfection date, disinfection location, irradiation time, cumulative time, lamp cleaning mark, signature of the executor, supervision and inspection by the infection control officer or person in charge, etc. The exposure time refers to the time from when the UV lamp is turned on to when it is turned off; the cleaning mark refers to the record after the lamp is wiped and cleaned. For convenience, it can be marked with "?"; the infection controller or person in charge must do this regularly or irregularly. Supervise and inspect the implementation of ultraviolet disinfection and registration status, and promptly correct any problems found.