Device for detecting and locating radiations, and in particular electron releasing phenomea

• US 4,280,075 A
• Filed: 07/06/1979
• Issued: 07/21/1981
• Est. Priority Date: 07/12/1978
• Status: Expired due to Term

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Comby, Georges, Mangeot, Philippe
• Primary Examiner(s): DEMEO, PALMER
• Application Number:
  US06/055,750
• Time in Patent Office: 746 Days
• Field of Search: 313/93, 313/309, 250/385
• US Class Current: 313/93
• CPC Class Codes: H01J 47/08 Geiger-Müller counter tubes gas filling with very short deionisation times H01J17/64, H01T

Abstract

A device for detecting and locating radiations, comprising at least one cathode brought to a first potential with respect to a reference potential in a sealed enclosure, a plurality of threadlike anodes insulated from one another and photosensitive means, said enclosure being provided with a port-hole transparent to the radiations involved, situated in register with said cathode and anodes, said device further comprising an insulating support with two faces, a portion of one of said two faces, situated in register with said port-hole, being coated with a layer of a conductive material forming a mesh network constituting said cathode, the extremities of said anodes being in the shape of a point and the axes of said anodes respectively coinciding with the axes of the meshes of said network, these points being recessed with respect to the insulating support face, coated with the network conductive meshes.

Claims

1. A device for detecting and locating radiations, comprising at least one cathode brought to a first potential with respect to a reference potential in a sealed enclosure, a plurality of threadlike anodes insulated from one another and photosensitive means, said enclosure being provided with a port-hole transparent to the radiation involved, situated in register with said cathode and anodes, said device further comprising an insulating support with two faces, a portion of one of said two faces, situated in register with said port-hole, being coated with a layer of a conductive material forming a mesh network constituting said cathode, the extremities of said anodes being in the shape of a point and the axes of said anodes respectively coinciding with the axes of the meshes of said network, these points being recessed with respect to the insulating support face, coated with the network of conductive meshes.

2. A device according to claim 1, wherein theinner face of said port-hole is coated with a web of a conductive material brought to a second potential with respect to the reference potential.

3. A device according to claim 2, wherein said photosensitive means are constituted by a deposit of a photosensitive material deposited on the upper face of said insulating support.

4. A device according to claim 3, wherein said photosensitive means further comprise at least one photoionisable gas circulating inside said enclosure.

5. A device according to claim 2, wherein said photosensitive means are constituted by at least one photoionisable gas circulating inside said enclosure.

6. A device according to any of claims 3 to 5, wherein further comprising means for detecting and locating the anodes, having a potential difference with respect to said reference potential.

7. A device according to claims 6, wherein said other face of the insulating support is coated with a further network of meshes of a conductive material, parallel with the meshes of the network forming the cathode, said further network being brought to a third potential with respect to said reference potential.

8. A device according to claim 7, wherein said insulating support is pierced with holes corresponding to the meshes of the network forming said cathode.