IBA Dosimetry Product Detectors

PPC40 Plane Parallel Chamber

Designed for absolute and relative electron beam dosimetry

The parallel plate ionization chamber PPC40 is designed for absolute and relative electron beam dosimetry above 2 MeV in the measuring quantity absorbed dose to water. It can be used for proton beam absolute and relative dosimetry and for photon beam depth-dose measurements as well. The PPC40 is entirely made from PMMA; with graphitized electrodes. It is constructed with a circular sensitive volume of planar geometry covered by a rigid 1 mm thick entrance window. As an associated measuring instrument for precise absolute dose determinations, in reference dosimetry, compliance testing or installation and set-up of treatment machines or other equipment, it is recommended to use the reference-class therapy dosimeter Dose1. The PPC40 is waterproof and its cable is covered by a watertight silicon sleeve that allows for air ventilation.

IBA Dosimetry Radiation Product PPC40
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IBA Dosimetry Radiation Product Detectors

Detector Brochure


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Technical specs

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 %