Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1987-12-28
1989-02-07
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250374, 250397, G01T 1185, G01T 129
Patent
active
048033685
ABSTRACT:
A transmission ion chamber assembly for detecting the lateral displacement of an ionizing beam has two ion chambers located one behind the other along the beam axis. Each chamber contains two electrode plates and a spacer which separates and electrically insulates the electrodes from each other. The electrodes of each chamber are inclined with respect to each other along a preselected measuring axis. The axes of both chambers are perpendicular to the beam axis and to each other. In operation, the collector electrodes furnish current signals which depend upon the position of the beam along the associated measuring axis. With orthogonal chambers, i.e. measuring axes, the beam position in a plane perpendicular to the beam axis can be determined and aligned, e.g. via beam steering coils surrounding the beam.
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Blissett et al. "Development of a Prototype Tapered Cell Drift Chamber", Nuclear Instruments & Methods in Physics Research 228 (1984) Dec., No. 1, pp. 45-50.
Medical Physics Review Article, C. J. Karzmark, "Advances in Linear Accelerator Design for Radiotherapy", 1984, pp. 105 to 128.
Edelman Lawrence C.
Fields Carolyn E.
Siemens Medical Laboratories, Inc.
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