Focused multielement detector for x-ray exposure control

Details Focused multielement detector for x-ray exposure control Focused multielement detector for x-ray exposure control

1989-06-05

1990-11-13

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

2503541, 2503851, 250389, 250396R, G01T 100, G01T 1185, H01J 4702

Patent

active

049703986

ABSTRACT:
A multi-zoned x-ray exposure detector for a scanning fan beam x-ray system comprises an electron emitter which upon exposure to x-rays emits electrons into a channel defined by an isolation walls. The channel contains air which is ionized. The isolation walls extend parallel to the direction of the sweeping fan beam behind the electron emitter. Within each channel formed by the isolation walls, is a collection electrode biased in voltage with respect to the electron emitter to collect the ions. The intersection of the beam and the channel defines a zone in which exposure may be determined.
The current from the collection electrode is amplified by an amplifier to produce a signal related to x-ray exposure of each zone.

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patent: 4707608 (1987-11-01), DiBianca
patent: 4764679 (1988-08-01), McDaniel et al.

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