PinPoint Ion Chamber 31023

Ultra small-sized therapy chamber for dosimetry in high-energy photon beams


  • Small-sized cylindrical ion chamber with vented sensitive volume of only 0.015 cm³
  • Very high spatial resolution when used for scans perpendicular to the chamber axis
  • Small polarity effect
  • Minimal cable irradiation effect

The PinPoint 0.015 cm³ chamber is ideal for dose measurements in small fields as encountered e.g. in IMRT and stereotactic beams as well as for FFF.
Relative dose distributions can be measured with very high spatial resolution when the chamber is moved perpendicular to the chamber axis.

The waterproof, fully guarded chamber can be used in air, solid state phantoms and in water.



  • Radioactive Check Device (T48012)

Radioactive check device for air density correction and constancy checks of therapy dosemeters when using vented ionization chambers.
Includes encapsulated low activity of 33 MBq.
Chamber holding devices and check device for use with flat chambers (T48010) optionally available.


Type No. 31023
Design: vented cylindrical ionization chamber, waterproof, fully guarded
Measured quantities: absorbed dose to water, air kerma, exposure
Nominal sensitive volume: 0.015 cm³, radius 1 mm,
length 5 mm
Reference point: on chamber axis, 3.4 mm from chamber tip
Nominal response: 400 pC/Gy
Chamber voltage: 200 V nominal, ± 500 V maximal
Radiation quality: 60Co ... 25 MV photons
Field size: (2 x 2) cm² ... (40 x 40) cm²
Connectors: BNT, TNC or M

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