NACP Plane Parallel Chamber

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 Workflow

Detectors RT

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Features

Inner dimensions

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

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 %

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

Chamber

Materials

Window thickness [mg/cm²]/[mm]

Active volume [cm³]

Electrode spacing [mm]

Collecting electrode diameter [mm]

Guard ring width [mm]

Waterproof

PPC05

Window and body C552; graphitized (PEEK) electrode

176 / 1

0.05

0.5

10

3.5

Y

PPC40

PMMA

118 / 1

0.4

2

16

4

Y

NACP

Mylar foil and graphite window; body PMMA; electrode graphitized

104 / 0.6

0.16

2

10

3

Y

Technical data is subject to change without prior notice. Depicted product images and specifications may differ from the actual scope of delivery.

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DETECTORS - For Relative and Absolute Dosimetry
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