Arktis - Model S670 - Fast Neutron Detector
The Arktis fast neutron detector provides spectral and timing information, unbeatable robustness, simple integration and operation in challenging environments. The easy to use fast neutron detector allows for a better understanding of the neutron flux in a given experimental area. A tunable and settable energy threshold allows to concentrate on the neutron energies of interest. The detector delivers a standard TTL output for each detected neutron, making it easily compatible with other detection systems and suitable for drop-in replacements. The Rugged-by-Design family of neutron detectors uses a SiPM* based signal readout, making it immune to shock and vibration, and scalable in length. The detectors can be custom built to user specifications.
Fast neutron detection
Fast neutrons are detected directly without the use of a moderator. They scatter elastically off the pressurized Helium-4 fill gas, producing scintillation light, detected by SiPM light sensors. Onboard electronics perform digital pulse shape discrimination to reject gamma induced events and provide a TTL pulse for each detected fast neutron.
Helium-4 (natural helium) provides high cross section for fission neutrons. Helium-4 is an excellent scintillation medium as it is transparent to its own light and has low electron density, making it insensitive to gamma radiation.
Benefit of fast neutron detection
Compared to thermal neutron detectors, no moderator is needed which tends to distort timing and energy information about the incoming neutron. Thus fast neutron detectors allow for more precise timing information, spectral information and, if combined with high gamma immunity, are excellent for operation in measurement environments with high thermal neutron or gamma background.
Our detector is comprised only of stainless steel, inert gas and military grade solid state circuitry. Unlike conventional detectors, no restricted, fragile or otherwise sensitive materials such as crystals, photomultipliers (PMTs) and anode wires sensitive to vibration, magnetic fields and microphonics are used.
Detector setup and operation
The detector is powered by 12 V (no high voltage necessary). It comes with a control unit which can be connected to a screen, mouse and keyboard or to LAN to remotely access and operate the detector and read out the device. Neutron counts can be read out via TTL or flat.
- Measure fast neutron dose rate
- Spectral information available
- Works also in high flux and high gamma background
- Nanosecond response time
- No moderator needed
- Sensitive to fast neutrons
- Uses natural helium (inert and abundant), not He-3
- Rugged design, consisting only of gas, steel and solid-state circuitry
- Modular and scalable
- Not susceptible to microphonics, magnetic fields or vibration
- Plug and play fast neutron detector
- Gamma immunity up to at least 200 uSv/hr with 0.9 < GARRn' < 1.1
- TTL output
- Timing information for identification of events and time of fight measurements.
Detector Specifications: S670
- Package: Detector with TTL output
- Physical Specifications: 915 mm total length, 600 mm sensitive length; max diameter: 70mm; weight: 6.6 kg
- Neutron Sensitivity: 0.04 cps/ng 252Cf at 2 m
- Gamma Rejection:
- Gamma rejection: 10-7
- Gamma immunity up to at least 200 µSv/hr with 0.9 < GARRn** < 1.1
- Signal Output:
- Female MCX coaxial output (MCX-BNC adapters available)
- TTL output available. TTL level 3.3 V, rise time < 5 ns; Drive current: 24 mA
- Pulse width: standard 80 ns, can be programmed from 10-2560 ns
- Control Cable Connection
- D-SUB 15 connector cable; Connected to control unit.
- Up to 8 detectors can be controlled and daisy-chained with one single control unit.
- Power Supply:
- 12 V, 2.5 W per detector. No high voltage required.
- Detectors can be daisy-chained.
- Operating Temperature: -30°C - 30°C (-22°F - 86°F ); larger temperature ranges available on request.
- Relative Humidity: 0-100% - operable in fog.
- Ingress Protection Degree: IP62. Higher IP degrees available on request.
- Conformity CE, 2014/68/EU