Related by context. Frequent words. (Click for all words.) 73 electromagnetic waves 70 electromagnetic fields 64 radiation emitted 60 cosmic rays 60 electromagnetic 59 ionizing radiation 59 radiation 59 cosmic radiation 58 magnetic fields 56 gamma rays 56 UV radiation 54 ultraviolet radiation 54 microwaves 54 electromagnetic interference 52 infrared radiation 50 ultraviolet light 50 photons 50 emitted 50 ultraviolet rays 50 UV light 49 radiation exposure 49 gamma radiation 48 electrical currents 48 gravitational waves 48 ionosphere 47 solar flares 47 UV rays 47 particles 47 radiofrequency 46 magnetosphere 46 UV exposure 46 diffraction 46 neutrinos 45 brain tumors 45 neutrons 45 terahertz 45 subatomic particles 45 Radiation 45 airborne particles 45 electrons 45 pulsar 45 photon 45 ions 44 ionization 44 EMF 44 millimeter wave 44 metamaterials 44 protons 44 laser beams 44 wavelengths 44 optical fibers 43 quantum mechanical 43 nanoparticles 43 carcinogenic 43 vibrations 43 nanotubes 43 irradiation 43 infrared 43 radioactivity 42 dust particles 42 quasars 42 neutrino 42 atoms 42 gamma ray burst 42 particle 42 UVB 42 distant galaxies 42 carbon nanotubes 42 acrylamide 42 emit 42 piezoelectric 41 ultraviolet 41 tiny particles 41 water vapor 41 sun rays 41 carcinogen 41 sunlight 41 electromagnetic spectrum 41 buckyballs 41 microscopic particles 41 toxins 41 particulates 41 infrared wavelengths 41 gliomas 41 gamma ray 40 quantum dot 40 asbestos fibers 40 radio frequency 40 antennas 40 vibrational 40 electron 40 nanomaterials 40 PAHs 40 potentially harmful 40 nanotube 40 neutron stars 40 cancerous cells 40 diesel fumes 40 cigarette smoke 40 waveguide 40 malignant tumors