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Common Questions for UVC Irrdiation Rays

Date:Dec 15, 2020

How can uvc irradiation rays kill all the viruses?

From a medical point of view, there is no concept of "kill all". However, the intensity and irradiation time of ultraviolet rays can be controlled to achieve a specific inactivation ratio, such as 99%, 99.99%, etc. The higher the inactivation ratio, the greater the UV dose required. As foreign media reports, the German UV technology developer Dr. Hönle announced that it has proven that shortwave UVC irradiation can effectively inactivate the new coronavirus. Meanwhile, Japan’s Miyazaki University and Nikkiso cooperated to study the sterilization effect of UVC LED lamps. On May 27, Miyazaki University announced that a joint experiment showed that the short-wave UVC LED lamps installed by Nikkei could effectively inhibit the infectious power of the new coronavirus and kill it.

For example, for UVC LED 30leds 12v, the sterilization rate is as below. 

30leds12v_

Time-consuming reference table

for E. coli/Staphylococcus aureus sterilization

Sterilization

Time

Unit

99.00%

0.69

Min

99.9%

1.88

Min



Time-consuming reference table

for Aspergillus flavus sterilization

Sterilization

Time

Unit

99.00%

10.37

Min

99.9%

31.10

Min


Time-consuming reference table

for Infectious hepatitis sterilization

Sterilization

Time

Unit

99.00%

0.84

Min

99.9%

2.51

Min



Time-consuming reference table

for Paramecium sterilization

Sterilization

Time

Unit

99.00%

20.94

Min

99.9%

62.83

Min



Can I disinfect masks with ultraviolet rays?

Medical masks are disposable items and it is recommended to replace them after each use. Only in the absence of masks, wearers of non-medical units can reasonably disinfect the masks and reuse them as an emergency. For instructions on the use of masks during the epidemic, please follow the guidance from the Health Commission and the national authority. 


For UVC LED, is the greater the power, the better or the longer the irradiation time, the better? 

From the perspective of virus inactivation, greater power and longer time can kill more viruses. However, according to the previous description, it should be noted that excessive ultraviolet rays will accelerate the aging of the mask, increase the probability of damage, break the rubber ear strap/headband, or fail the rubber sheet in the breathing valve. Even when disinfecting other items, large doses of ultraviolet rays will accelerate the aging and even damage of plastic products, clothing fabrics, and electronic products. Therefore, the choice of ultraviolet disinfection equipment should not only satisfy the effect, but also not excessive, but should be used scientifically.


Can I disinfect my hands/face/body with ultraviolet rays?

Absolutely not! Ultraviolet rays are harmful to skin and eyes. Ultraviolet rays can only be used for the destruction of unmanned rooms and objects. It is strictly forbidden to use it on any human body parts.


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