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: 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 %
- FC23 Ion Chamber with Chamber Cap
- FC Ion Chamber with Chamber Cap in Large Universal Chamber Holder
- FC Ion Chamber in Large Universal Chamber Holder
Technical specifications
- FC65-G — Cavity volume (cm³): 0.65; Cavity length (mm): 23.1; Cavity radius (mm): 3.1; Wall material: Graphite; Wall thickness (g/cm²): 0.073; Central electrode material: Aluminium; Waterproof: Y
- FC65-P — Cavity volume (cm³): 0.65; Cavity length (mm): 23.1; Cavity radius (mm): 3.1; Wall material: POM; Wall thickness (g/cm²): 0.057; Central electrode material: Aluminium; Waterproof: Y
- FC23-C — Cavity volume (cm³): 0.23; Cavity length (mm): 8.8; Cavity radius (mm): 3.1; Wall material: C552; Wall thickness (g/cm²): 0.07; Central electrode material: C552; Waterproof: Y
Technical data is subject to change without prior notice.
