RTI CT Ion Chamber


The RTI CT Ion (Ionization) Chamber for use with the Piranha, Cobia FLEX R/F, or Cobia SENSE. The RTI CT Ion Chambers – 10 cm and 30 cm – are intended for CTDI and dose length product measurements on CT scanners in a phantom or free-in-air.

Both chambers can be connected via the RTI Chamber Adapter to the Piranha or to the Cobia. The 10 cm chamber can also fit into standard phantoms used for CTDI measurements.

They fulfill applicable parts of the IEC 61674 standard for diagnostic dosemeters and are thereby compatible with IEC 61223-2-6 and 66601-2-44 for applicable CT dosimetry.

The chambers come with RQT9, 120 kV, and W/Al + 0.25 mm Cu as standard calibration.


Please specify on the order if you would rather have another calibration.

Note: The RTI Chamber Adapter is also required.

All prices include freight cost. Pricing does not include Applicable Taxes or Customs Fees.

RTI CT Ion Chamber 10 cm
The 10 cm chamber has an active volume of 5.3 cc and an active length of 100 mm.
RTI CT Ion Chamber 30 cm
The 30 cm chamber has an active volume of 16 cc and an active length of 300 mm.

Ranges with Piranha & Cobia FLEX (RTI Chamber Adapter required)

  • Air kerma rate
    0.3 mGycm/s to 3 Gycm/s
  • Inaccuracy
    ±5 % or ±0.03 mGycm/s
  • Connector type
    LEMO triaxial
  • Cable
    2 m, low noise triaxial
  • Active volume
    16 cm³
  • Active length
    300 mm
  • Diameter
    12 mm, 12.6 incl O-rings
  • Typical leakage
    ±20 fA
  • Radiation quality
    70 - 150 kV
  • Sensitivity
    30 mGycm/nC
  • Energy dependence
    ±1 %