Kobe University in Japan is reported to be working with yoshi, a Japanese 

maker of LED components A joint study by Ushio found that deep ultraviolet 

radiation with a wavelength of 222nm affects human skin and skin Eyes are 

harmless.

The deep ultraviolet wavelength of 200-280nm has bactericidal effect and 

has been widely used in sterilization.However,However, UVC radiation is 

harmful to human skin due to its penetrating power.However, kobe university 

and youzhiwang The study found wavelengths of 222nm and 254nm for the 

ability to kill bacteria on the skin Deep ultraviolet photobactericidal efficacy 

is comparable, and 222nm UVC radiation does not cause skin cancer.

This is the world's first demonstration of strong bactericidal effects by 222nm 

deep uv directly and repeatedly Exposure does not cause skin cancer, showing 

that the 222nm wavelength of deep ultraviolet light on the human eye and skin 

Skin is safe.For this reason, the technology is expected to be widely used in 

medical institutions and daily life To sterilize.

The study was titled "long-term effects of 222nm ultraviolet radiation C 

sterilizing lamps on mice susceptible to ultraviolet radiation".

The team exposed the mice to different levels of ultraviolet radiation.One 

group was placed under a 222-nm sterilizing lamp, while the others were 

placed under a 280-315 nm UVB light.The results showed that the mice 

exposed to the UVB light developed skin cancer and showed adverse 

reactions, while the mice exposed to the 222nm sterilization lamp did not 

develop skin cancer.They also looked at its effect on the mice's eyes, and 

found no abnormalities even under a microscope.

As a result, the team concluded that since the 222nm ultraviolet light reaches 

only the outermost layer of the skin, the cuticle, it does not damage the DNA 

of skin cells and ultimately has no adverse effects.

Studies have shown that deep ultraviolet irradiation with a wavelength of 

222nm has a strong disinfection ability and is harmless to human skin, so the 

technology is expected to be widely used in the field of sterilization.

The results were published March 29 in the international journal Photochemistry 

& Photobiology and will be presented June 28 at the American society for 

Photobiology biannual meeting (ASP) 2020 in Chicago.