electron tube that receives a pattern of radiation, as infrared, ultraviolet, or x-ray, on a photosensitive surface and reproduces the pattern ona fluorescent screen, muundur, mis tajub kiirgusmustrit, nt infrapuna-, ultraviolett- või röntgenkiirgusmustrit, valgustundlikul pinnal ja edastab mustri luminofoorekraanil, converter tube in which a well defined and controllable beam of electrons is produced and directed on to a surface to give a visible or otherwise detectable display or effect