Ionization chamber having off-passageway measuring electrodes

Details Ionization chamber having off-passageway measuring electrodes Ionization chamber having off-passageway measuring electrodes

1996-10-24

1997-09-30

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

G01T 1185

Patent

active

056728786

ABSTRACT:
An ionization chamber for monitoring a radiation beam includes a housing having a primary beam passageway and a number of secondary beam cells that are adjacent to the primary beam passageway. The primary beam passageway passes entirely through the housing. In the preferred embodiment, a large-area beam measuring electrode and an array of small-area beam measuring electrodes are each coaxial with the primary beam passageway. Also, in the preferred embodiment, each secondary beam cell includes a beam measuring electrode. Because the portions of the radiation beam that enter the secondary beam cells do not pass through the ionization chamber, these portions do not contaminate the treatment beam, allowing the beam measuring electrodes within the cells to be dimensioned and configured so as to maximize signal strength.

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patent: 4427890 (1984-01-01), Taumann
patent: 4627089 (1986-12-01), Menor et al.
patent: 4751393 (1988-06-01), Corey, Jr. et al.
patent: 5072123 (1991-12-01), Johnsen
patent: 5326976 (1994-07-01), Kikuchi

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