Helium-3 Neutron Detectors 10 mm diameter

Features

• Accurate localization of neutrons in neutron scattering
• 1 200 detectors 12NH25/1 on the TOF IN5 spectrometer of the RHF (ILL Grenoble-france)
• Measurement of soil dampness in petroleum drilling
• Active lengths: 1 cm, 12.5 cm, 25 cm (other lengths on request (for quantities above 10 pieces)
• Standard Helium-3 pressure: 8 bars, up to 20 bars on request (> 10 pieces)
• Active diameter: 9 mm
• Electrical output on wire, HV BNC or ATI
• Weight reduction of the detector+moderator system
• Excellent sensitivity-to-space ratio

Description

The 10 mm diameter neutron detectors allow accurate localization of neutrons.

These detectors are then widely used in neutron scattering experiments, around research nuclear reactors and neutron spallation sources. Angular position measurements and/or Time-of-Flight are performed simultaneously on large detection areas. For example, 1 200 12NH25/1 detectors have been installed on the historical TOF IN5 spectrometer of the Hifg Flux Reactor of the Laue- Langevin Institute at Grenoble.

For these neutron scattering applications, following characteristics have been optimized:
- very low background resulting from a severe selection of materials,
- very low jitter due to the choice of an appropriate gas mix,
- mechanical presentation adapted to the manufacturing of multi-element devices, with an electrical output on wire and a built-in mechanical binding.

The 10 mm diameter detectors are also used in the measurement of soil dampness in oil drilling; in that application, their excellent sensitivity-to-space ratio is of much interest.

The 0.5NH1/1K miniature and isotropic model is remarkable due to its very small size (active length 1 cm, diameter 1 cm) and its sensitivity (0.5 cps/nV); these characteristics make it a unique sensor for the equipment of light weight neutron monitors (as an example, in the dose rate meter-dosemeter DINEUTRON wighing only 3.5 kg).