Becquerel ray, Grenz ray, Roentgen ray, X radiation, X ray, actinic ray, alpha radiation, alpha ray, anode ray, beta radiation, beta ray, canal ray, cathode glow, collision emission, cosmic radiation, cosmic ray, cosmic ray bombardment, electron beam, electron emission, electron ray, field emission, gamma radiation, gamma ray, glow discharge, grid emission, infraroentgen ray, nuclear rays, photoemission, positive ray, radiorays, secondary emission, thermionic emission, thermionic grid emission