Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1984-05-23
1986-06-17
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250385, H01J 4706
Patent
active
045958343
ABSTRACT:
An imaging proportional counter which significantly reduces parallax errors when imaging point sources of radiation located at variable distances from the detector entrance window. The imaging proportional counter includes a gas filled enclosure with a concave shallowly curved radiation permeable entrance window allowing radiation from the source to enter the enclosure. A multi-wire grid assembly is spaced behind the entrance window within the enclosure. When a potential difference is applied between the grid assembly and concave entrance window an electrostatic field is generated such that near the interior surface of the window the field lines form a spherically focussed region. The concave entrance window also allows increased fill gas pressures such that radiation entering the detector will interact with the fill gas very near the entrance window while still in the spherically focussed region. Free electrons produced in the interaction drift along the curved electrostatic field lines to the detector electrode assembly where electronic signals are produced indicative of the two-dimensional coordinates of the location where the radiation entered the detector. The combination of a concave radiation entrance window with increased fill gas pressure reduces parallax errors in applications where the point source of radiation is located a distance from the detector that is less than approximately four times the radius of curvature of the window.
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Frieze et al., "A High Resolution Multiwire Proportional Chamber System", Nuclear Instru. & Methods, 136 (1), Jul. 1, 1976, pp. 93-97.
R. W. Hendricks, "One-And Two-Dimensional Position-Sensitive X-Ray and Neutron Detectors", pp. 103-146, Transactions of the American Crystallographic Association, 1976.
Fields Carolyn E.
Smith Alfred E.
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