612,899. Electron discharge apparatus. TEXACO DEVELOPMENT CORPORATION. Feb. 26, 1948, Nos. 5762 and 5763. Convention dates, Nov. 2, 1940, and Sept. 27, 1941. [Class 39 (i)] A radiation detection device of the Geigercounter type consists of a series of parallel plates 10b, Fig. 5, connected together and forming the cathode, with wires 12b parallel to and between the plates to form the anode, the whole being enclosed in a glass envelope with a filling of an inert gas at low pressure. In a modification, Fig. 7, the cathode plates are in the form of concentric cylinders 10c. A further modification is shown in Fig. 9, consisting of spaced parallel plates 24, forming the cathode, and the anode wires 26 passing through aligned holes 22 in the plates. In modifications of this arrangement, the plates may be joined to form a helical or zig-zagshaped member. The plates may be coated with a lithium or boron compound to increase the sensitivity of the device to slow neutrons or with a secondary electron emissive substance. The Specification as open to inspection under Sect. 91 comprises also the following: (a) the anode is in the form of a plate 12d, Fig. 10 (Cancelled), with ribs 20; (b) the anode wires pass through holes in a series of insulating discs 50, Fig. 17 (Cancelled), mounted in a metal cylinder 52; (c) the cathode is formed of metal cones 116, Fig. 19 (Cancelled), or annularly corrugated plates or rings nested together with the anode wires passing through aligned holes, preferably elliptical in shape. This subjectmatter does not appear in the Specification as accepted.
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