PinPoint 3D Ion Chamber

Ultra small-sized therapy chamber with 3D characteristics for dosimetry in high-energy photon beams

  • Small-sized cylindrical ion chamber with vented sensitive volume of only 0.016 cm³
  • Small polarity effect
  • Minimal cable irradiation effect
  • Minimized directional response
  • Short ion collection time, low pre irradiation dose
  • Suitable for field sizes from 2 cm x 2 cm to 40 cm x 40 cm

The PinPoint 3D chamber is ideal for dose measurements in small fields as encountered e.g. in IORT, IMRT and stereotactic beams but can also be used for measurements in large fields. Designed for radial beam orientation, the small-sized chamber shows excellent 3D characteristics. Relative dose distributions can be measured with high spatial resolution in any direction.
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. 31022
Design: vented cylindrical ionization chamber, waterproof, fully guarded
Measured quantities: absorbed dose to water, air kerma, exposure
Nominal sensitive volume: 0.016 cm³, radius 1.45 mm,
length 2.9 mm
Reference point: on chamber axis, 2.4 mm from chamber tip
Nominal response: 400 pC/Gy
Chamber voltage: 300 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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