Factors Affecting the Radiation Intensity of Ultraviolet Lamps

Ultraviolet radiation intensity is the most basic factor affecting the disinfection effect. According to the requirements of disinfection technical specifications, the radiation intensity of ultraviolet lamps is greater than or equal to 100uW/c㎡ (at a distance of 1m) to be qualified, and the minimum radiation intensity of lamps in use should be It can be used when it reaches 70uW/c㎡, but the irradiation time must be extended. According to the formula that the ultraviolet irradiation dose is equal to the radiation intensity multiplied by the irradiation time, the prolonged irradiation time required for different intensities can be obtained. If the intensity of the ultraviolet light source is lower than 40uW/c㎡, then prolonging the irradiation time cannot achieve satisfactory sterilization and mildew prevention, that is, stop using it. Don't think that as long as the UV lamp is on, it has a sterilizing effect.

UV light to kill fungi has different effects depending on the wavelength of light. When the wavelength of light is below 300nm, it will have the effect of killing fungi, and when the wavelength of light is near 260nm, the killing effect of bacteria will be more obvious. However, the killing effect on bacteria is also directly related to the environment in which the mold exists and whether there are variants of bacteria.

1. Factors affecting the radiation intensity of UV lamps

The standard unit of ultraviolet lamp sterilization equipment in actual use is the amount of radiation and illuminance, which is based on the amount of ultraviolet radiation required by ultraviolet rays to kill bacteria with strong anti-ultraviolet light ability. Species such as Aspergillus niger and Bacillus subtilis require higher levels of UV light.

(1) Ambient temperature

The ambient temperature has a certain influence on the intensity of ultraviolet radiation. If the temperature is too high or too low, the radiation intensity will be reduced. For example, when the temperature drops to 4 °C, the radiation intensity can be reduced by about 65% to 80%, which will seriously affect the fungicidal effect. Generally, room temperature 20-40℃ is the suitable temperature for ultraviolet disinfection. In this temperature range, the intensity of ultraviolet radiation is the largest and stable, and the ideal disinfection effect can be achieved.

(2) Relative humidity

Relative humidity is high, and UV radiation penetrates cells less. According to relevant literature, when the relative humidity is 55% to 60%, the killing rate of ultraviolet rays on microorganisms is the strongest. When the relative humidity is above 60% to 70%, the sensitivity rate of microorganisms to ultraviolet rays decreases. On the contrary, it has an activating effect on microorganisms, which can reduce the bactericidal power by 30% to 40%. Immediately after wet mopping and wiping the table top, UV disinfection will increase the indoor humidity and affect the disinfection effect. Therefore, the room should be kept clean and dry when using ultraviolet disinfection.

2. UV lamp application industry

Ultraviolet lamps can be used for surface sterilization and mildew prevention; import and export shoe industry mildew proof, leather bag mildew proof, granary sterilization and mildew proof, experimental sterilization box, food production line equipment, etc.; effectively inhibit the reproduction of bacteria and mildew to achieve disinfection and mildew proof final effect.

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Xin'an Industrial Zone, Danzao Town, Nanhai, Foshan, Guangdong Province, China