Miniature gamma ionization chambers

Photonis produces Miniature Gamma Ionization Chambers mainly dedicated for the measurement of high intensity gamma radiations, as close as possible to the gamma generator.

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Small external dimensions (upon customer's request)
Measurement of high intensity gamma radiations
High reliability and long operating life
Customization according to the user’s needs

Miniature gamma ionization chambers

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Technical information

Basic type External diameter (mm) Length (mm) Gamma sensitivity (A/Gy.h-1 60Co)
CRGE10/Xe 7 85.5 4.5x10-11
CRGE10/N2 7 85.5 4.8x10-13


By full control of the following processes, Photonis Nuclear Instrumentation can supply custom gamma ionization chambers with the highest quality and reliability levels

  • Adaptation of industrialized gamma ionization chambers to customer specific requirements.
  • Development of new gamma ionization chambers with our experienced R&D team.
  • Long term collaboration with the French Alternative Energies and Atomic Energy Commission / CEA (theoretical approach, - modeling, qualification tests in research reactors).
  • Complete manufacturing process on site.
  • Support from all the Photonis Group activities, experience and knowledge.
  • Certifications & Quality Assurance programs adapted to the customer environment.
  • Technical support, applying expertise

Examples of custom versions from basic types

Gamma sensitivity tailored to individual requirement

Connector type (BNC, BNC HT, HN, SMA or others)

  • Adapted external dimensions and mechanical interfaces
  • Ruggedized structure for harsh environment (radiation, temperature, humidity, mechanical stress)

Main features

  • Structure: One coaxial mineral insulated cable connected to the detector.
  • Electrodes: The two electrodes consist of a concentric stainless steel tube assembly.
  • Filling gas: The gas type and pressure depend on the required sensitivity. Standard gases are nitrogen or xenon.
  • Insulators: As it is necessary to measure extremely low currents, insulators must be of very high quality and radiation resistant. Photonis only uses high-grade alumina insulators from qualified suppliers.


The  French Alternative Energies and Atomic Energy Commission (CEA) selected Photonis as its technological partner for a cooperative development of neutron and gamma detectors when the French nuclear power program took shape in the sixties.

Our references

Fuel reprocessing plant – AREVA/COGEMA/ORANO – Numerous gamma ionization chambers – France, Japan.