How do CRTs work? What kind of radiation do they emit?
CRTs (Video Display Terminals) emit various EMF (Electro – Magnetic Field) frequencies. The specific frequencies vary for each CRT type. Emissions generally consist of pulsed VLF (Very Low Frequencies) electric and magnetic fields from 10kHz to 30kHz and pulsed ELF (Extremely Low Frequencies) electric and magnetic fields from 60Hz to 75Hz. Scientific observation has led some to believe that the ELF magnetic field is the dominant wave form given off by CRTs and that ELF magnetic fields are CRTs’ most dangerous radiation. See Macworld, July 1990, for an excellent explanation of how CRTs work.
