Abstract: A method of photodegrading a metallic chelate complex wherein ultraviolet light is directed into an aqueous solution of a metallic chelate to photodegrade the metallic chelate and isolate the metallic portion. The ultraviolet light has a wavelength of no greater than about 210 nm and the method is especially adapted for photodegrading metallic chelates in electroless nickel plating baths and metallic ethylenediamine triacetic acid to recover the metallic portions as well as reduce toxic waste.

Abstract: An improved radiation-emitting device of the type for containing gas and an electron flow therein between electrodes. First and second separate elongated principal members form an elongated envelope volume having constant cross-sections along its length. The first principal member is outwardly convex and radiation-transmissive and the second is inwardly concave and radiation-reflective, preferably having a metallic inner coating. The members are arranged and configured so that the envelope volume is less than that of a cylinder of similar cross-dimension. Pural electrodes are preferably used.

Abstract: An improved radiation-emitting device of the type for containing gas and an electron flow therein between electrodes. Inner and outer tubular members form an elongated annular envelope volume. The inner tube is radiation-transmissive and the outer tube is preferably radiation-reflective, preferably having metallic inner coating. Fluid passing through the inner tube is irradiated.

Abstract: An improved radiation-emitting device of the type for containing gas and an electron flow therein between electrodes. First and second separate elongated principal members form an elongated envelope volume having constant cross-sections along its length. The members are arranged and configured so that the envelope volume is less than that of a cylinder of similar cross-dimension. The inner surface of the second principal member has projecting structures which extend to distal ends adjacent to the first principal member.