NACP can be used for proton beam absolute and relative dosimetry and for photon beam depth-dose measurements. NACP is designed according to recommendations of the Nordic Association of Clinical Physicists (NACP), Acta Radiologica Oncology 19,55. The chamber is used for absolute dosimetry of electron beams 2-50 MeV. A thinner front wall minimizes contamination of the beam, allows measurements at shallow depths, and guarantees high accuracy even at low electron energies. The collecting electrode is manufactured of graphitized polystyrene. The NACP chamber cable is covered by a watertight silicone sleeve that allows for air ventilation.
Used for: Detectors RT
Features
Inner dimensions
- Sensitive volume (nominal): 0.16 cm³
- Cylinder height: 2.0 mm
- Entrance window (polarizing electrode) diameter: 20 mm
- Entrance window thickness: mylar foil 0.1 mm & graphite 0.5 mm
- Diameter of collecting electrode: 10.0 mm
- Guard ring outer diameter: 18 mm
- Guard ring width: 3.0 mm
Operational characteristics
- Polarizing voltage: ±200 V (max. ±400 V)
- Typical leakage current: 5 fA
- Recommended pre-irradiation: 5 Gy
- Typical sensitivity: 6 nC/Gy
- Guard potential: ±200 V (max. ±400 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.
