UV Lights and Lamps: Ultraviolet-C Radiation, Disinfection

The destruction of materials in nature and humidity in nature causes difficult economic losses every year. UV accelerated weather test machines can reproduce the damage caused by sunlight, rain and dew. The equipment is exposed to the exposure of the tested material in the controlled sunlight and the interactive cycle of moisture, and at the same time improve the temperature to test it. The device uses ultraviolet fluorescence lights to simulate the sun, and at the same time, it can also simulate the effects of moisture through condensation or spraying.

In accordance with the requirements of the new IEC and national standards on the safety of optical creatures in the new IEC and national standards, the evaluation methods such as the light chemical hazards of the skin and eyes that exist in actual applications in the actual application are discussed. UV spectrum radiation method measures the method of active radiation measurement of ultraviolet. Combining the two actual ultraviolet lights, the conditions of safe use of UV lamps were analyzed and discussed, and it provided the actual basis for people to use ultraviolet lamps safely.

I. Introduction
The electromagnetic spectrum from 100nm to 400nm is Ultraviolet Radiation -UVR. UV radiation of the sun is the main body of ultraviolet radiation accepted by humans. However, due to the attenuation process of ultraviolet rays in atmospheric dissemination, the amount of ultraviolet radiation that truly illuminates the surface of the earth only accounts for about 4%of the total radiation. But it is a very important natural physical factor, and various creatures maintain normal metabolism. The Lighting Commission (CIE) divides the ultraviolet spectrum into three biomedicons to discuss the biological effects of UVR: UV-A is 320 ~ 400nm, UV-B is 280 ~ 320nm, and UV-C is 100 ~ 280nm. The wavelength is very easily absorbed by air below 180nm, so there is actually not much biological significance. Not only does the solar radiation of ultraviolet rays, some artificial light sources such as ultraviolet lights, arcs, etc. can also produce ultraviolet radiation. At present, UV applications have developed rapidly. For example, the solidification, photographic version, photographic, photocopy, skin diseases and internal surgical disease treatment, sterilization, health, fluorescent analysis and other fields of light -sensitive materials such as light -sensitive paint or ink have developed rapidly. However, excessive ultraviolet radiation can also have a negative impact on human health. Therefore, humans must protect ultraviolet damage while developing and using ultraviolet rays. The organs that are vulnerable to UVR are eye and skin, because they are exposed to the air, and from the examples of some dental diseases, the interior of the mouth may be radiated. But as long as we can control ultraviolet radiation within the appropriate range, people can live and work normally under ultraviolet radiation without being harmed by such radiation. This is the purpose of studying the safety of ultraviolet bands.

II. UV light source light safety requirements
1. Optic chemical ultraviolet hazards of the skin and eyes
The irradiation time is within 8 hours (no more than 8 hours), and the exposure limit of the ultraviolet effective radiation of the skin and eyes that are not taken to take protection measures is 30J • M-2. In order to protect the damage to the ultraviolet radiation caused by the eyes or the skin from the wide spectrum light source, the effective points spectrum of the light source should not exceed the limit defined by the following formula.

2. The spoke spectral range of near-ultraviolet hazards in the eyes of the eyes is ranging from 315nm to 400nm (UV-A). 2; In the case of time greater than 1000s, the UV-A band radiation of the eyes that do not take protection measures should not exceed 10W • m-2. (1), (2) In the formula: e （(λ, t) -the spectral radiation degree, the unit is W • M-2 • NM-1; SUV (λ) -The weighted function of photochemical ultraviolet hazards (see Figure below Show); -The wavelength bandwidth, the unit is NM; T -radiation time, the unit is seconds.

UV disinfection methods generally use ultraviolet sterilization lamps as ultraviolet radiation sources. It is required to digit ≥1.5W per cubic meter of space ultraviolet lamp, and the irradiation time is generally 30 to 60min. It also requires that the radiation strength of ultraviolet rays must not be less than 70UW/CM2, otherwise the sterilization effect will be poor or invalid, and the purpose of disinfection will not be achieved. As the UV sterilization lamp is extended, the effective radiation of ultraviolet rays will continue to weaken and sterilizer effect will continue to be reduced. When the radiation strength is lower than 70UW/CM2, the lamp tube needs to be replaced.

GB 19258-2003 the definition of UV sterilization lamps in UV sterilization lamps is: a low-pressure mercury steam lamp with quartz glass or other purple-transmitted glass, which generates ultraviolet radiation mainly based on the wavelength of 253.7nm. Its ultraviolet radiation energy kill bacteria and viruses.

Radiation illuminance refers to the radiation flux that radiates to the surface of this point. Except for the area of the surface, the unit is UW/CM2. Radiation flux refers to the power that is launched, transmitted or accepted in the form of radiation. Technical requirements for radiation illumination: The initial ultraviolet radiation illumination of UV sterilization lights should not be less than 93 % of the rated value.

III. UV lamp test equipment requirements:
Option 1: Economic and convenient portable spectroradiometer
LISUN LMS-6000UV Spectroradiometer can test UV-A, UV-B, UV-C and UV total Radiant Irradiance, UV hazard irradiance, UV spectrum, Dominant Wavelength, Peak signal, Start wavelength, End wavelength. Please click here to see theLMS-6000UV Test Report.

UV lightsource test report

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