PPC40 is a parallel plate ionization chamber for absolute and relative dosimetry of electron (≥2 MeV) and proton beams, as well as photon depth-dose measurements. Made entirely of PMMA with graphitized electrodes, PPC40 features a circular planar-sensitive volume with a rigid 1 mm entrance window. Waterproof with a ventilated silicone-covered cable, it is ideal for precise absolute dose determinations in reference dosimetry and equipment setup.
Used for: Commissioning PT, Detectors RT, Monthly QA RT, Monthly QA PT, Annual QA PT, Commissioning and Annual QA RT
Features
Outer dimensions
- Chamber outer diameter: 44.0 mm
- Chamber body height: 10.0 mm
- Stem diameter: 10.0 mm
- Stem length: 50.0 mm
Inner dimensions
- Sensitive volume (nominal): 0.40 cm³
- Cylinder height: 2.0 mm
- Entrance window (polarizing electrode) diameter: 20.0 mm
- Entrance window thickness: 1.0 mm
- Diameter of collecting electrode: 16.0 mm
- Guard ring diameter: 17.8 mm
- Guard ring width: 3.4 mm
Operational characteristics
- Polarizing voltage: ±300 V (max. ±500 V)
- Typical leakage current: 5 fA
- Recommended pre-irradiation: 5 Gy
- Typical sensitivity: 11 nC/Gy
- Guard potential: ±300 V (max. ±500 V)
- Temperature range: 15 to 35 °C
- Relative humidity range: 20 % to 80 %
Technical specifications
- PPC05 — Materials: Window and body C552; graphitized (PEEK) electrode; Window thickness [mg/cm²]/[mm]: 176 / 1; Active volume [cm³]: 0.05; Electrode spacing [mm]: 0.5; Collecting electrode diameter [mm]: 10; Guard ring width [mm]: 3.5; Waterproof: Y
- PPC40 — Materials: PMMA; Window thickness [mg/cm²]/[mm]: 118 / 1; Active volume [cm³]: 0.4; Electrode spacing [mm]: 2; Collecting electrode diameter [mm]: 16; Guard ring width [mm]: 4; Waterproof: Y
- NACP — Materials: Mylar foil and graphite window; body PMMA; electrode graphitized; Window thickness [mg/cm²]/[mm]: 104 / 0.6; Active volume [cm³]: 0.16; Electrode spacing [mm]: 2; Collecting electrode diameter [mm]: 10; Guard ring width [mm]: 3; Waterproof: Y
Technical data is subject to change without prior notice.
