Ultraviolet radiation
Ultraviolet radiation is optical, electromagnetic radiation with a wavelength of 100 nm to 1mm.
Ultraviolet radiation with a wavelength of 100 nm to 400 nm can be divided into:
Germicidal radiation - UVC wavelength of 253.7 nm is invisible. This radiation (in the UVC spectrum) causes mortality of microorganisms in a way that their DNA is distorted and hence they are destructed. Blue light produced by germicidal lamps is only a byproduct. This part of the spectrum is not antiseptic. Germicidal radiation does not pass through matt, non-transparent materials, neither through glass, which creates a reliable barrier for it. This radiation only passes through quartz glass and special Teflon foils.