Gamma ionization chambers
In gamma detectors,gamma radiation produces electrons by interacting with the cathode material and the filling gas. The resulting charge is collected and supplied as a direct current to measurement electronics.
Gamma ionization chambers
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| 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 |
| CRGA11 | 18 | 234 | 1.5x10-10 |
| CRGB10/N2 | 48 | 140 | 6x10-10 |
| CRGB10/Xe | 48 | 140 | 7.2x10-8 |
| CRGJ16 | 42.5 | 189 | 5x10-8 |
Description
Gamma ionization chambers are used in a variety of applications such as area radiation monitors, fuel re-processing, spent fuel monitoring, and research activities at labs and reactors world-wide.Detection efficiency depends on gamma quanta energy, cathode material and thickness, filling gas type and pressure. Detector sensitivity is therefore very dependent on the detector design. Due to the dominance of the photoelectric effect in electron creation, the maximum sensitivity occurs at about 80 keV. At high gamma energies (> 500 keV), the sensitivity can fall to one hundredth of the maximum for the same mechanical design.
Enhancing Nuclear Safety with Photonis Gamma Ionization Chambers
Detection and measurement of gamma radiation plays a pivotal role in various scientific and nuclear applications. Our Gamma Ionization Chambers are designed to provide accurate measurements of gamma radiations across a range of intensities and energies, catering to the unique needs of scientists and nuclear professionals.
Key Features:
- High reliability and long operating life
- Customization options to align with specific user requirements for both area radiation monitoring and laboratory experiments.
- Detection efficiency is dependent on factors like gamma quanta energy, cathode material and thickness, filling gas type, and pressure can be modified to meet customer needs
At Photonis, we understand that precision is vital in scientific endeavors. Our Gamma Ionization Chambers are meticulously engineered to ensure low leakage currents and optimal sensitivity, allowing wide range of operation tailored to the application.
Custom Gamma ionization chambers
By full control of the following processes, Photonis Nuclear Instrumentation can supply custom gamma ionization chambers with the highest quality and reliability.
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 our expertise in design and manufacture of nuclear instrumentation to solve customer challenges.
Main features
Structure: One or two coaxial mineral insulated cable(s) connected to the detector.
Electrodes: Two electrodes arranged ina guarded concentric tube assembly. Electrodes may be either stainless steel or aluminum construction.
Filling gas: The gas type and pressure depend on the required sensitivity. Standard gases are nitrogen or xenon.
Insulators: Photonis only uses high-grade, radiation resistant alumina insulators from qualified suppliers to ensure the measurement of extremely low currents.
Integral cable: Integral cables are recommended for both the signal and high voltage lines when operating in severe environments.
Examples of customization of standard parts
Gamma sensitivity tailored to individual application requirements.
Connector type (BNC, BNC HT, HN, SMA or others).
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: Two electrodes in 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: Photonis only uses high-grade, radiation resistant alumina insulators from qualified suppliers to ensure the measurement of extremely low currents.
References
The French Alternative Energies and Atomic Energy Commission (CEA) selected Photonis as its technological partner for a co-operative 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.
Documentation
Brochure/Leaflet
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