Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1986-08-12
1988-08-16
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
2503851, 378 19, G01T 1185, H01J 4700
Patent
active
047646799
ABSTRACT:
Quantum detection efficiency and spatial resolution in a kinestatic charge detector are improved by utilization of an x-ray transmissive device positioned within a collection volume of a kinestatic charge detector x-ray detection chamber for displacing the charge carrier generating medium within predetermined areas of the chamber. Within the chamber, quantum detection efficiency and spatial resolution are affected by distortion in electric field lines existing between a high voltage anode and a relatively low voltage collector electrode. The distorted field lines cause charge carriers generated in the medium by impinging radiation to impact on either the walls of the chamber or to follow non-linear paths between the point of creation and the collection electrode. By displacing the medium in the chamber in areas having the greatest electric field distortion, the quantum detection efficiency and spatial resolution are improved. In one embodiment an x-ray transmissive device is placed in the chamber adjacent an x-ray emitting window and has a portion extending partially into the space between the anode and collector electrode. In another embodiment, an additional device is positioned in the chamber adjacent a rear wall thereof for displacing the medium in the rear portion of the chamber.
REFERENCES:
patent: 4190771 (1980-02-01), Kamei et al.
patent: 4376893 (1983-03-01), Whetten
patent: 4686369 (1987-08-01), McDaniel et al.
Frank A. DiBianca and Marion D. Barker, "Kinestatic Charge Detection", Med. Phys., vol. 12, No. 3 (May/Jun. 1985) pp. 339-343.
Granfors Paul R.
Hoffman David M.
McDaniel David L.
Beusse James H.
General Electric Company
Hannaher Constantine
Howell Janice A.
Stoner Douglas E.
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