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 CT ion chambers combine robust design with uniform energy response for high energy MV applications.
For performing measurements necessary for calculating CTDI (CT dose index.)
The Model A17 Exradin Slice Therapy Chamber is designed for tomotherapy applications. This chamber is useful for weekly QA checks or patient dose verification with phantoms or water tank setups. It has excellent response uniformity over the central 8 cm of the chamber length, with variation less than plus or minus 1.5%.
Its waterproof construction makes it ideal for checking the consistency of beams at various jaw widths. The chamber vents through a flexible tube that surrounds the triaxial cable, ensuring the collecting volume is in pressure equilibrium with the surroundings. The design assures there are no stem or voltage soakage effects, providing precise and reliable measurements.
Features and Benefits
• Fiducial markers identify center and both ends of the collecting volume providing easy setup in relation to the beam
• Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
• Shell and guard are made of durable, long lasting Shonka conductive plastic
• Use of homogeneous material throughout the chamber minimizes perturbation of the beam due to the presence of the chamber and optimizes measurements
• Axially symmetric design of the chamber provides an uniform, isotropic response
• Inherent waterproof construction eliminates need for additional protective coverings
• The Model A17 Exradin Slice Therapy Chamber has an inherent 60Co buildup cap built into its wall thickness for air calibrations and measurements
• Ionization collection efficiency is 99.9% or better
• Collecting volume is 1.91 cc
Specifications
Collecting Volume: 1.91 cm3
Collecting Volume Length: 8.0 cm
Collector Diameter: 2.4 mm
Body Tube Outside Diameter: 12.7 mm
Wall Thickness: 3.3 mm
Chamber Length: 17.0 cm
Body Tube and Guard Material: Shonka air-equivalent plastic C552
Response Uniformity Over the Central 8.0 cm of Chamber Length: ± 1.5%
Collector Material: Carbon fiber
Electrical Power Requirements: Operates at ± 300 VDC
Nominal Collection Efficiency: 100%
Maximum Polarizing Potential: 1000 V
Nominal Inherent Leakage Currents: 10-15 A
Low-Noise Triaxial Cable: 50 ohms, 29 pF/ft, 1.5 m long 
Signal Connector: Triaxial BNC plug (2-Lug, male pin); others available upon request
Waterproof: Yes
Product Standards: CE0413, Designed to meet IEC 60601-1, IEC 61674
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