WHAT IS UVC LIGHT?
Ultraviolet (UV) light is a component of the electromagnetic spectrum that falls in the region between visible light and X-Rays.
Most natural UV light is generated by the sun with about ten percent of sunlight being UV and only about three to four percent penetrating the atmosphere to reach the ground.
Of the UV radiation that reaches the earth,
95 percent is UVA and 5 percent is UVB.
No measurable UVC from the sun reaches the earth’s surface. Because of the spectral sensitivity of DNA,
only the UVC region demonstrates significant germicidal properties.
HOW DOES UVC DISINFECTION WORK?
As evident by multiple research studies and reports, when biological organisms are exposed to deep UV light in the range of 200 nm to 300 nm it is absorbed by DNA, RNA, and proteins.
Absorption by proteins can lead to rupture of cell walls and death of the organism. Absorption by DNA or RNA (specifically by thymine bases) is known to cause inactivation of the DNA or RNA double helix strands through the formation of thymine dimers. If enough of these dimers are created in DNA, the DNA replication process is disrupted, and the cell cannot replicate.
CELLS THAT CANNOT REPLICATE, CANNOT INFECT.
It is widely accepted that it is not necessary to kill pathogens with UV light, but rather apply enough UV light to prevent the organism from replicating. The UV doses required to prevent replication are orders of magnitude lower than required to kill, making the cost of UV treatment to prevent infection commercially viable.
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