CT Ion Chambers

Exradin CT Chambers are durable detectors for performing the measurements necessary in the CTDI (computed tomography dose index) calculations described in TG-74.

The Exradin Advantage

  • Fiducial markers identify the center and both ends of the collecting volume for easy setup in relation to the beam.
  • Air-equivalent conductive plastic eliminates fragility or flaking of painted conductive layers.


Exradin A17 Ion Chamber

The A17 is tailored for MV and tomotherapy applications such as weekly QA checks or patient dose verification with phantoms and water tanks. It has excellent response uniformity over the chamber length with variation less than ±1.5%.

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Exradin A101 Ion Chamber

The A101 performs the measurements necessary for calculating the CTDI as described in TG-74. It has excellent response uniformity over the chamber length with variation less then ±3%.

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Exradin A101 Exradin A17
Collecting Volume 4.54 cm3 1.91 cm3
Outside Diameter of Shell 10.0 mm 12.7 mm
Inside Diameter of Shell 8.0 mm 6.0 mm
Shell Wall Thickness 1.0 mm 3.3 mm
Collector Diameter 2.5 mm 2.5 mm
Collector Length 100 mm 80 mm
Shell, Collector, and Guard Material A A
Nominal Air Kerma Calibration Factor 6.2E+6Gy/C 1.5E+7Gy/C
Nominal Leakage +/-10 fA +/-10 fA
Maximum Polarizing Voltage 1000 VDC 1000 VDC
Waterproof No Yes
Included Accessory PMMA sleeve to adapt chamber for 0.50" (12.7mm) phantom holes Integral 60Co Buildup in shell wall


Product Resources

Publications, tech notes, testimonials, and other resources to support CT Ion Chambers.

Looking for a user manual?

Available on request. Contact your Account Manager


View publications related to this product from experts in the fields of medical physics and oncology.

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Tech Notes

Find detailed instructions on how to setup and execute common processes from our experienced technicians.

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