Isn't radiation dangerous?

The term radiation should not be frightening.  It does not imply radioactivity, which is the radiation of atomic particles due to the spontaneous decay of an unstable substance.  Light and heat from an incandescent bulb are radiation, the ripples in a pond from a dropped pebble are radiation, and the sounds of speech are radiation, these last two being examples of radiation that is not electromagnetic.  Radiation simply means dispersal.