UVC, with a wavelength of 200-280nm, has a bactericidal effect. Its bactericidal principle is that when the ultraviolet light of this band irradiates the bacterial body, the nucleoprotein and DNA of the cell strongly absorb the energy of this band, and the chains between them are opened and broken, so that the bacteria die.
The UVC has weak penetration ability, and cannot penetrate ordinary glass and plastic. It is suitable for surface sterilization of daily necessities.
It should be noted that when UVC are strongly applied to the skin, it will produce actinic dermatitis, and will cause actinic ophthalmia when it is applied to the eyes. Therefore, human body should be away from UVC sterilization to avoid possible harm.