Farmer-type ionization chambers are used for absolute dosimetry of photon, electron, and proton beams, as well as depth dose and field profile measurements. The FC65-G chamber is for reference dosimetry and calibrations, while FC65-P is for daily machine checks and routine applications. These chambers work with medical accelerators, X-ray beams (≥70 kV), gamma radiation (¹³⁷Cs, ⁶⁰Co), and proton beams (50–250 MeV). Also, FC65-G is MRI linac compatible.
Compatible with: TG106
Used for: Commissioning PT, Monthly QA RT, Annual QA PT, Commissioning and Annual QA RT, Monthly QA PT, Detectors RT
Features
Inner dimensions
- Sensitive volume (nominal): 0.65 cm³
- Total length: 23.0 mm
- Total cylinder length: 20.0 mm
- Inner diameter of outer electrode: 6.2 mm
- Diameter of inner electrode: 1.0 mm
- Length of inner electrode: 20.5 mm
- Wall thickness of outer electrode: 0.4 mm
Operational characteristics
- Polarizing voltage: ±300 V (max. ±500 V)
- Recommended pre-irradiation: 5 Gy
- Typical sensitivity: 21 nC/Gy
- Guard potential: ±300 V (max. ±500 V)
- Temperature range: 15 °C to 35 °C
- Relative humidity range: 20 % to 80 %
- FC65 Ion Chamber with Chamber Cap
- FC65 G/P with Chamber Cap in Large Universal Chamber Holder
- FC65 G/P 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.
