FC23-C Ionization Chamber

FC23-C is a shortened farmer-type ionization chamber for absolute dosimetry of photon, electron, and proton beams at therapy-level dose rates.

FC23-C measures absorbed dose to water, air kerma, and exposure in air, depending on radiation type and calibration. Designed for medical accelerators, it also works with X-ray beams (70–280 kV), gamma radiation (¹³⁷Cs, ⁶⁰Co), and proton beams (50–250 MeV).

Used for Workflow

Detectors RT,

Monthly QA RT,

Commissioning and Annual QA RT

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Features

Inner dimensions

Inner dimensions

  • Sensitive volume (nominal) 0.23 cm3
  • Total sensitive length: 9.0 mm
  • Total cylinder length: 6.0 mm
  • Inner diameter of outer electrode: 6.2 mm
  • Wall thickness of outer electrode: 0.4 mm (0.056 g/cm2 )
  • Diameter of inner electrode: 1.0 mm
  • Length of inner electrode 7.5 mm

Operational characteristics

Operational characteristics

  • Polarizing voltage: ±300 V (max. ±500 V)
  • Typical leakage current: 3 fA
  • Recommended pre-irradiation: 5 Gy
  • Typical sensitivity: 7.2 nC/Gy
  • Guard potential: ±300 V (max. ±500 V)
  • Temperature range: 15 °C – 35 °C
  • Relative humidity range: 20 % – 80 %

Inner dimensions

  • Sensitive volume (nominal) 0.23 cm3
  • Total sensitive length: 9.0 mm
  • Total cylinder length: 6.0 mm
  • Inner diameter of outer electrode: 6.2 mm
  • Wall thickness of outer electrode: 0.4 mm (0.056 g/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: 3 fA
  • Recommended pre-irradiation: 5 Gy
  • Typical sensitivity: 7.2 nC/Gy
  • Guard potential: ±300 V (max. ±500 V)
  • Temperature range: 15 °C – 35 °C
  • Relative humidity range: 20 % – 80 %

Technical specifications

Cavity model

Cavity volume (cm³)

Cavity length (mm)

Cavity radius (mm)

Wall material

Wall thickness (g/cm²)

Central electrode material

Waterproof

FC65-G

0.65

23.1

3.1

Graphite

0.073

Aluminium

Y

FC65-P

0.65

23.1

3.1

POM

0.057

Aluminium

Y

FC23-C

0.23

8.8

3.1

C552

0.07

C552

Y

Technical data is subject to change without prior notice. Depicted product images and specifications may differ from the actual scope of delivery.

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Brochures

DETECTORS - For Relative and Absolute Dosimetry
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