Claims
- 1. Apparatus for X-ray radiography, comprising:
- a first conductive planar electrode adapted to transmit a pattern of differentially-absorbed X-ray radiation;
- a second conductive planar electrode spaced from, and parallel to, said first electrode;
- a sheet of insulative material adjacent a surface of said second electrode facing said first electrode;
- a structured photocathode fabricated as a block of X-ray photoemissive material directly upon the surface of said first electrode facing said second electrode, said block photoemissive material having a multiplicity of substantially randomly arranged apertures formed completely therethrough;
- an avalanche-amplifying gas filling the gap between said insulative sheet and said structured photocathode and filling the volume of the apertures to first electrode surface;
- means for forming an electric field between said first and second electrodes;
- the photoemissive material of said photocathode emitting, responsive to said X-ray radiation, charged particles from the entire surface area thereof, said charged particles interacting with said gas and said field, respectively, for amplification and subsequent collection at said sheet.
- 2. Apparatus as set forth in claim 1, wherein said structured photocathode is formed of cesium iodide.
- 3. Apparatus as set forth in claim 1, wherein said apertures are substantially cylindrical.
- 4. Apparatus as set forth in claim 3, wherein the diameter of each aperture is on the order of 10 microns and the spacing between adjacent apertures is on the order of 13 microns.
Parent Case Info
This is a division, of application Ser. No. 759,426, filed Jan. 14, 1977.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3327151 |
Adams et al. |
Jun 1967 |
|
3769059 |
Driard et al. |
Oct 1973 |
|
3940620 |
Houston et al. |
Feb 1976 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
759426 |
Jan 1977 |
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