Cathode-ray tube ultraviolet light source

A cathode-ray ultraviolet light source comprising:

• an elongated glass envelope having a first end and second end, the glass envelope defining an evacuated volume;
• an electron gun positioned within the evacuated volume proximate to the first end and being capable of developing an electron beam;
• a target suspended within the evacuated volume between the first and second end of the glass envelope, the target comprising a phosphor material covered with a reflective metal film, wherein the phosphor material emits ultraviolet (UV) light in the wavelength range of 190-280 nm;
• an electron beam focusing and deflecting mechanism disposed within the evacuated volume between the electron gun and the target to direct the electron beam towards the reflective metal film of the target to penetrate the metal film and cause the phosphor material to emit UV light.