A system and method to provide uniform, high intensity radially inwardly directed electron beams to the interior of a cylindrical volume for the purpose of destroying toxic, hazardous, or noxious organic and/or inorganic compounds contained in air or other media flowing through a cylindrical region or to destroy or inactivate bacteria, viruses, fungi, or mold spores in such flowing media to sterilize contents of flowing media to treat fluidized grains, herbs, or other products or to destroy chemical warfare agents. A window assembly to transmit electromagnetic radiation, for example, an electron beam, x-rays, or other high energy electromagnetic radiation, is also disclosed.
