Patent ID: 8119978

Claim:
An area integrated fluence monitoring sensor for measuring a radiation dose from an ionizing radiation beam, wherein the sensor comprises: at least one Gradient Ion Chamber (GIC) comprising: an ion chamber having a volume gradient across a length or width thereof; a pair of polarizing electrodes defining upper and lower portions of the ion chamber and providing a portion of a housing for the at least one GIC, the pair of polarizing electrodes being oriented with respect to one another to provide the volume gradient; a gas or liquid located within the ion chamber; and an electrode to detect ions generated within the gas or liquid when the at least one GIC is subjected to the ionizing radiation beam, the electrode to detect ions being a collector plate disposed between the pair of polarizing electrodes, wherein the ion chamber has a surface area larger than a cross-sectional area of the ionizing radiation beam at the at least one GIC and the sensor encodes a location and amount of ionizing radiation provided by the radiation beam at the at least one GIC.