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
Features
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
