Specials

PPC40 Parallel plate ion chamber for electron beams, 0.4 ccm
As designed and constructed by PTB Braunschweig, M. Roos, K. Derikum, D. Lange. The chamber is entirely made from PMMA; electrode areas are additionally graphitized. The waterproof chamber is vented through a silicone sleeve and it is constructed with a circular sensitive volume of planar geometry covered by a rigid 1 mm thick front window.

The combination of design and material minimizes perturbation components, the in-scattering and the backscatter effect, to a perturbation correction factor equal to unity.
As an associated measuring instrument for precise absolute dose determinations, in calibration dosimetry, compliance testing or installation and set-up of treatment machines or other new equipment, it is recommended to use the reference-class therapy dosimeter Dose1 or Dose2.