Disinfection method and radiation intensity detection of medical ultraviolet lamp

Medical ultraviolet lamps mainly sterilize indoor air. There are two methods: indirect irradiation and direct irradiation.

Indirect irradiation method: the use of high-intensity ultraviolet air sterilizer has the advantage of reliable disinfection effect and can be used when there are people indoors. The disinfection time is generally 30 minutes. The principle of the shooting method is to suck the dirty air into the disinfection machine. The ultraviolet lamp is sealed in the disinfection room of the air disinfector’s chassis, and the dirty air is filtered and sterilized before being released. Since the ozone concentration in the air when the sterilizer is working is ≤0.1 mg / m³, human-machine coexistence can be achieved. The ultraviolet peak wavelength of the intensity ultraviolet sterilizer is 253.7nm, which belongs to UVC, also known as short-wave sterilization. The shorter the ultraviolet wavelength, the greater the lethality.

Direct irradiation method: When there is no one in the room, the ultraviolet lamp is used for direct irradiation. The number of disinfection lamps installed indoors is not less than 1.5W per cubic meter, and the irradiation time is not less than 30 minutes. The peak wavelength of the ultraviolet germicidal lamp is 253.7nm.

The state stipulates that the intensity of the ultraviolet lamp should be greater than 70μW / cm² at a position 1 meter vertically below the center of the lamp. Ultraviolet lamps will attenuate, so the intensity of the lamp should be checked every time. The ultraviolet radiation intensity is the most basic factor that affects the disinfection effect. According to the requirements of the “Disinfection Technical Specification”, the radiation intensity of the new ultraviolet lamp should be greater than 100μW / cm2 (at a distance of 1m). The minimum should be 70μW / cm2 for temporary use, but the irradiation time must be extended.

The radiation intensity of the ultraviolet lamp can be tested using LISUN LPCE-2 (LMS-9000BUV) ultraviolet lamp. This system is specially used to test the radiation intensity, spectrum, efficiency, CRI, CCT, UVA, UVB, UVC radiation and electrical parameters of ultraviolet lamps (light sources). The test spectrum range is 200 ~ 400nm. The test system includes LMS-9000BUV high-precision UV spectroradiometer, UV quartz optical fiber, UV test dark box (to ensure that the distance from the UV probe to the UV light source is 1 meter), UV standard lamp and calibration power supply (optional).

Here is photo below shows the test system:

The following is the test report of this product for your reference:

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