X-ray ionization chamber FC23-C

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 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 %