This is a classic question, UVC Deep ultraviolet radiation poses little harm to human skin, But it can cause significant eye damage to the human body. typical UVC-LED wavelength 275 nm The ultraviolet light is almost 97%The above will be absorbed by the stratum corneum of human skin, 99. 9%The above is absorbed by the stratum corneum and epidermis, A very small portion of light will hit the dermis layer. Ultraviolet radiation can only cause skin cell carcinogenesis when it acts on the dermis layer. So it is generally believed that UVC Ultraviolet radiation has little effect on human skin. Of course, baby skin, Including thinner stratum corneum of some human skin, to UVC The resistance to ultraviolet radiation is even worse. The human eye lacks protection from the stratum corneum. UVC Direct ultraviolet radiation will cause damage to the crystalline lens, Corneal lesions. Therefore, it is forbidden for the human eye to directly look at the illuminated area UVC-LED LED package.
The shorter the wavelength of light, the poorer its penetration ability, This is determined by the wave particle duality of light. Of course, specifically in terms of matter, It's also related to absorption. UVC Is deep ultraviolet radiation harmful to the human body? The most convenient answer is, have, Do not expose yourself UVC In ultraviolet radiation. But in fact, there is a big misconception in between, exactly UVA, for example 365, 385, 395 The damage to human skin is significant, Because this wavelength of ultraviolet radiation can penetrate the dermis layer of the human body, Causing skin cell carcinogenesis.
but UVC ultraviolet, for example 275nm, The transmission depth in adult epidermis is much shallower. After penetrating the stratum corneum, 97%The above energy will be absorbed, The energy connection that ultimately penetrates into the dermis layer 0. 1%none of them. so, To be precise, UVC Deep ultraviolet radiation poses little harm to human skin, Eyes without a stratum corneum are much more dangerous. of course, Even the weakest light can be harmful to the human body if exposed for a long time.
So don't blindly fear UVC duv, Because short-term skin irradiation damage can be ignored; Don't risk yourself either, stare at LED It will definitely cause eye injuries.