In Gamma Detectors, the gamma radiations produce electrons by interacting with the cathode material and the filling gas.
Measurement of high intensity gamma radiations
High reliability and long operating life
Customization according to the user’s needs
Description
These electrons ionize the gas and the charge carriers are collected by the electrodes. The resulting anode pulse is detected by a load circuit. The primary electrons are created by several interaction mechanisms:
Photoelectric effect
Compton scattering
Pair production
The mechanism 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, but is always energy-dependent. Due to the dominance of the photoelectric effect, 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.
Main Features
Structure: High electrical insulation by use of two coaxial integrated cables in a guard-ring configuration.
Electrodes: The two electrodes consist of a concentric metal tube assembly, arranged in a guard-ring configuration. The electrodes are made of aluminum or stainless steel.
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.
Integral cable: Integral cables are recommended for the signal and for the high voltage when operating in severe environments
In Gamma Detectors, the gamma radiations produce electrons by interacting with the cathode material and the filling gas.
- Measurement of high intensity gamma radiations
- High reliability and long operating life
- Customization according to the user’s needs
Description
These electrons ionize the gas and the charge carriers are collected by the electrodes. The resulting anode pulse is detected by a load circuit. The primary electrons are created by several interaction mechanisms:
- Photoelectric effect
- Compton scattering
- Pair production
The mechanism 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, but is always energy-dependent. Due to the dominance of the photoelectric effect, 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.
Main Features
- Structure: High electrical insulation by use of two coaxial integrated cables in a guard-ring configuration.
- Electrodes: The two electrodes consist of a concentric metal tube assembly, arranged in a guard-ring configuration. The electrodes are made of aluminum or stainless steel.
- 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.
- Integral cable: Integral cables are recommended for the signal and for the high voltage when operating in severe environments
