IBA Dosimetry Product Detectors

CC25 Ionization Chamber

QA in air and low dose in water measurements

The ionization chamber CC25 is intended for absolute and relative dosimetry of photon, electron, and proton beams in radiotherapy. Measurements can be performed in air, water phantoms, or solid phantoms. The CC25 is a high spatial resolution, small volume chamber. It is waterproof, vented through a waterproof sleeve, and fully guarded.

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IBA Dosimetry CC25
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IBA Dosimetry Radiation Product Detectors

Detector Brochure


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Technical specs

Inner dimensions

  • Active volume: 0.25 cm3
  • Total active length: 10 mm
  • Cylinder length: 7 mm
  • Inner diameter of outer electrode: 6.0 mm
  • Wall thickness: 0.4 mm (70 mg/cm2 )
  • Diameter of inner electrode: 1.0 mm
  • Length of inner electrode: 7.5 mm

Operational characteristics

  • Polarizing voltage: ±300 V (max. ±500 V)
  • Typical leakage current: 5 fA
  • Recommended pre-irradiation: 5 Gy
  • Typical sensitivity: 7.5 nC/Gy
  • Guard potential: ±300 V (max. ±500 V)
  • Temperature range: 15 °C – 35 °C
  • Relative humidity range: 20 % – 80 %


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