Parallax-free gas detector for x-rays

Details Parallax-free gas detector for x-rays Parallax-free gas detector for x-rays

1989-04-27

1990-09-04

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250374, 250375, H01J 4702

Patent

active

049547100

ABSTRACT:
An X-ray gas detector for analyzing a material by studying X-ray diffraction. In order to minimize the parallax error without resorting to auxiliary electrodes, difficult to manufacture, a radial field in the whole gas space (40) is generated only by means of input electrodes (36) set to appropriate voltages and by means of lateral electrodes (44) also individually set to appropriate voltages. By modifying the voltages, it is also possible to move the center of the spheric equipotentials for permitting the analysis without parallax error of samples (20) placed at variable distances (D) from mthe input window (32) of the detector.

REFERENCES:
patent: 4595834 (1986-06-01), Burns
P. F. Christie, E. Mathieson and K. D. Evans, "An x-ray imaging proportional chamber incorporating a radial field drift chamber," Journal of Physics E: Scientific Instruments, vol. 9, (1976), pp. 673-676,.COPYRGT.1976.
U. Nauenberg and G. Schultz, "Parallel Wire Drift Chamber With Variable Field Shaping Wire Voltages," Nuclear Instruments and Methods, vol. 137, No. 2 (Sep. 1, 1976), pp. 213-217, .COPYRGT.North-Holland Publishing Co.
G. Charpak, Z. Hajduk, A. Jeavons, R. Kahn and R. Stubbs, "The Spherical Drift Chamber for X-Ray Imaging Applications," IEEE Transactions on Nuclear Science, vol. NS-22, (Feb. 1975), pp. 269-271.
G. Charpak, Z. Hajduk, A. Jeavons, R. Stubbs and R. Kahn, "The Spherical Drift Chamber for X-Ray Imaging Applications," Nuclear Instruments and Methods, vol. 122, No. 3, (Dec. 15, 1974), pp. 307-312, .COPYRGT.North-Holland Publishing Co.
"A Spherical Drift Chamber Area Detector for X-ray Crystallography", C. Bolon et al., IEEE Transaction on Nuclear Sciene, vol. NS-26, No. 1, Feb. 1979.
"Development of a MultiWire Proportional Chamber as an Area Sensitive Detector for X-ray Protein Crystallography", D. Bade et al., Nuclear Instruments & Methods, vol. 201(1982), pp. 193-196.
G. Charpak, "Parallax-Free High-Accuracy Gaseous Detectors for x-Ray and VUV Localization", Nuclear Instruments and Methods, (1982), pp. 181-192.

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