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February 19 , 20
202212_09
  Science
  LIGHT THAT KILLS MICROBES
Researchers are developing lamps that could stop the spread of disease
  遠–紫外線UVC
  能夠殺死微生物、 阻止疾病傳播的光
  by Elizabeth Koroma

 

12b09

SCIENCE

2022 December 19, 20

Level: High

 

Light That Kills Microbes

by Elizabeth Koroma

 

Researchers are developing lamps that could stop the spread of disease

 

19

Owing to the recent pandemic, researchers have been on a quest to find more ways to kill viruses, and one result of their work involves light.

  It has long been known that ultraviolet (UV) light can destroy microbes such as bacteria and viruses. It is already used as a cleaning agent in hospitals and to purify air and water – but only when people aren’t around. That’s because there are three types of UV light: UVA, UVB and UVC, and they are all detrimental to humans. UVA and UVB exposure can lead to skin cancer, while UVB is responsible for sunburns. UVC light is mostly absorbed by the Earth’s atmosphere, but it is even more dangerous. Artificial UVC light can pass through the outer layer of skin and eye cells to damage the living cells underneath.

  However, there is a type of UVC light, known as far-UVC, which does not pass through the outer layer of cells. But studies of the long-term effects of far-UVC on humans, as well as studies on groups comprising more than 20 people, are not yet available.

 

 

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