Gamma ionization chambers

Name: Gamma ionization chambers
Brand: Exosens

In gamma detectors, gamma radiation interacts with the cathode material and the filling gas, producing electrons. These electrons generate a charge that is collected and transmitted as direct current to the measurement electronics for further analysis.

Within these detectors, gamma or X-ray radiation interacts with the electrodes and filling gas, producing charged particles. The generated charge is collected and measured as direct current within the associated electronics

Wide dynamic range with measurement of low-to-high intensity gamma radiation

Options to detect low energy to high energy X-ray and gamma radiation

Exceptional reliability and extended operating life

Guarded designs to maximizes signal-to-noise ratio

Gamma ionization chambers

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Technical Information

Product^[a]	Diameter (mm)^[b][c]	Sensitive Length (mm)^[b][c]	Sensitivity^[b][d] (A/Gy/h)	Material	Fill Pressure (Bar)	Typical Fill Gas	Type^[f]
CRGE10	7	15	4.5x10^-13 to 4.2x10^{-11 [e]}	Stainless Steel	≤10 1	Xe, N₂	Miniature
CRGA11	18	150	1.6x10^{-10 [e]}	Stainless Steel	1	N₂	Tubular
IG20	29^[k]	-	≈3.0x10^-14	Stainless Steel	5.8^[z]	Ar/N₂/He	Spherical
IG34	35	46^[y]	1.71x10^-8	Stainless Steel	20^[z]	Xe	Tubular
IG35	35	46	5.6x10^-10	Stainless Steel	1.6^[z]	Xe	Tubular
CRGJ16	42	120	4.7x10^{-8 [e]}	Stainless Steel	-	-	Tubular
CRGB10	48	30	5.6x10^-10 to 6.7x10^{-8 [e]}	Stainless Steel	15 1	Xe, N₂	Tubular
IG26	51	110 - 368	≈2.3x10^-8to 1.1x10^{-7 [g]}	Stainless Steel	≤50^[z]	Various^[h]	Tubular
IG1	90	115	≈2.1x10^-9to 9.1x10^{-8 [g]}	Stainless Steel	≤20^[z]	Various^[h]	Domed^[i]
IG21	95	126	≈2.3x10^-8to 2.6x10^{-7 [g]}	Stainless Steel	≤50^[z]	Various^[h]	Domed
IG47	120	100	5.5x^-8 A/Sv/h	Stainless Steel	10^[z]	Argon	Through-hole
IG48	150	176	1x10^-4 C/Sv	Polyethylene	Ambient	Air	Tubular
IG5	186	350	≈1.4x10^-7to 1.7x10^{-6 [g]}	Mild Steel	≤40^[z]	Various^[h]	Domed^[i]
IG5T	183	350	≈9.8x10^-8to 1.2x10^{-6 [g]}	Mild Steel	≤15^[z]	Various^[h]	Domed^[i]
IG11	185	322	≈1.0x10^-6 to 1.9x10^{-6 [g]}	Mild Steel	≤20^[z]	Various^[h]	Re-entrant
IG12	185	320	≈7.5x10^-9to 1.6x10^{-6 [g]}	Mild Steel	≤20^[z]	Various^[h]	Re-entrant
IG32	185	48	1.43x10^-7	Mild Steel	3.1^[z]	Argon	Parallel Plate
IG42	190	293	-	Aluminium	≈11.3^[z]	Nitrogen	Through-hole

[a] Significant catalogue of ionisation chamber designs and variants available. Table shows the most popular variants
[b] Nominal values stated
[c] Excludes any containment and/or termination compartments
[d] Measured against 137Cs and utilising standard tolerance of ±20%, unless otherwise stated. Assumes 1 Gray = 114 Roentgen
[e] Assumes 137Cs is 93% of 60Co sensitivity
[f] Design, materials and manufacturing process are common among most of these devices. Consequently, operation capability is common and may be transferable
[g] Subject to specific configuration
[h] Typical or maximum value stated. Alternative available, subject to requirement and 2014/68/EU. Common gas types utilised: Ar, N2, Air, H, Ne, Kr, Xe or mixtures thereof
[i] Domed design allows for a more uniform polar response
[k] Spherical section only

*Sensitivity is approximately proportional to filling pressure

Description

Gamma ionization chambers are used in a variety of scientific, nuclear, and safety-related applications such as radiation area monitors, fuel re-processing, health physics, and research activities at labs and reactors worldwide. Detection sensitivity depends on the gamma energy and electrode materials, as well as the filling gas type and pressure.

Enhancing Safety with Exosens’ Gamma Ionization Chambers

Detection and measurement of gamma radiation play a pivotal role in various scientific, health physics 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 our customers.

Key Features:

Exceptional reliability and extended operating lifetime to ensure long-term performance in critical applications Customization options to meet specific user requirements, from radiation area monitoring to laboratory experiments.
Optimized detection sensitivity and energy response

At Exosens we recognize the importance of precision in scientific endeavours. Engineered for minimal leakage currents and optimal sensitivity, our Gamma Ionization Chambers offer a broad range of operational flexibility, tailored to meet the needs of your specific application.

Custom Gamma ionization chambers

By full control of the following processes, Exosens can supply custom gamma ionization chambers with the highest quality and reliability.

Adaptation of industrialized products to customer-specific requirements, building on significant operational experience.
Development of new gamma ionization chambers with our experienced research and development teams.
Long-term development, modelling and test collaborations with internationally renowned research organizations.
Complete manufacturing and test processes on site.
Support from all the Exosens group activities, experience, and knowledge.
Highly regulated Quality Assurance programs adapted to the customer’s environment.
Expertise in design and manufacture of nuclear instrumentation to solve customer challenges.

Main features

Structure: One or two terminations.
Electrodes: Various material types utilized, with options for guarded designs
Filling gas: Multiple gas types and pressure options, subject to the required sensitivity and gamma energies.
Insulators: Exosens only uses high-grade, radiation-resistant insulators from qualified suppliers to ensure the measurement of extremely low currents.
Integral cable: Integral organic and mineral-insulated cable designs are available

Examples of Customization of Standard Parts

Gamma energy and sensitivity tailored to individual application requirements.
Customized connector type (BNC, HN, SHV and many others).
Mechanical interfaces and assemblies.
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: Exosens 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 Exosens 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.

THE INFLUENCE OF THE TYPE OF FILLING GAS ON THE RESPONSE OF IONISATION CHAMBERS TO A MIXED HIGH-ENERGY RADIATION FIELD, S. Mayer et al., Rad. Pro. Dos. (2007)