Ionization chamber having off-passageway measuring electrodes

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

G - Physics

01

T

G01T 1/29 (2006.01) G01T 1/185 (2006.01) H01J 47/02 (2006.01)

Patent

CA 2218833

An ionization chamber (36) for monitoring a radiation beam includes a housing having a primary beam passageway (86) and a number of secondary beam cells (88 and 90) 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 (54) and an array (58) of small-area beam measuring electrodes (60, 62, 64 and 66) are each coaxial with the primary beam passageway. Also, in the preferred embodiment, each secondary beam cell includes a beam measuring electrode (68, 70, 72 and 74). Because the portions (76, 78, 80 and 82) 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.

Chambre d'ionisation (36) pour surveiller un faisceau de rayonnement comprenant un logement, traversé entièrement par un conduit de faisceau primaire (86), et plusieurs cellules de faisceau secondaire (88 et 90) qui sont contiguës au conduit de faisceau primaire. Dans la réalisation préférée, une électrode de mesure de faisceau de large étendue (54) et de nombreuses (58) électrodes de mesure de faisceau de faible étendue (60, 62, 64 et 66) sont toutes dans le même axe que le conduit de faisceau primaire. De plus, chaque cellule de faisceau secondaire comprend une électrode de mesure de faisceau (68, 70, 72 et 74). Comme les parties (76, 78, 80 et 82) du faisceau de rayonnement qui entrent dans les cellules de faisceau secondaire ne traversent pas la chambre d'ionisation, elles ne contaminent pas le faisceau de traitement, permettant aux électrodes de mesure à l'intérieur des cellules d'être dimensionnées et configurées de façon à maximiser l'intensité du signal.

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