Ionization Chamber Advances

Jul 15, 2020 - Upgraded gold electrodes for increased performance


Pyramid continues to advance the performance and reliability of its ionization chamber products. Pyramid engineer Nick Dart, working in the ionization chamber assembly and test lab, has provided details of a new build of the flash therapy optimized IC64-6 chamber that demonstrates advances in gold coating, laser patterning and connection methods. The new chamber is showing good performance and stability in in-house testing and will be demonstrated on a proton system at an early opportunity.

The new gold electrodes provide:

  • More precise and very consistent pattern writing
  • Improved long term connection reliability
  • Excellent high voltage stability

Following tests on the IC64-6, the new methods will be implemented on other chambers including the larger area IC128-25 models.



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Proton Therapy


Proton therapy is well established for the treatment of localized cancer tumors, especially when there are vital organs close by. This healthy tissue sparing makes it the method of choice for maintaining quality of life and especially for treating children. The proton beam delivery is fast and painless.

Proton therapy centers worldwide use Pyramid sensors, electronics, and software. Pyramid offers products for complete systems, sub-systems, or components. For more information see our Pencil Beam Scanning Brochure


Ion Chambers


The ionization chamber or ion chamber is conceptually the simplest of all gas-filled radiation detectors, and is widely used for the detection and measurement of ionizing radiation. It is the preferred device for proton therapy dose and beam position monitoring due to a combination of robustness, gain stability, very low material budget in the beam path and availability of large continuous sensing areas.

Pyramid offers a wide range of ionization chambers for proton and heavy ion therapy applications. Advanced electrode coating and patterning allows the creation of precise strip and pixel patterns for position readout. A wide range of sensitive areas and electrode gaps is provided to suit different system geometries and beam currents.