Neutron howitzer and neutron scattering spectrometer

Abstract

The invention discloses a neutron howitzer and a neutron scattering spectrometer. The invention relates to the technical field of neutron scattering, and solves the problem that while increasing the neutron transmissivity, the prior art has poor radiation aging-resistant capability. In the scheme provided by the embodiment of the invention, the neutron howitzer comprises partitions, and is characterized in that: each partition consists of a carrier layer and a neutron-absorbing layer, the carrier layer is a metal foil, and the neutron-absorbing layer is attached on the carrier layer. The embodiment of the invention is applicable to neutron measurement instruments and the like.

Description

technical field [0001] The invention relates to the technical field of neutron scattering, in particular to a neutron collimator and a neutron scattering spectrometer. Background technique [0002] As a neutron optical device, the neutron collimator is one of the core components of the neutron scattering spectrometer. Its function is to filter the neutrons in different directions emitted by the neutron source, and only make the divergence angle less than or equal to the neutron neutron required by the experiment. The neutron collimator can improve the resolving power and counting efficiency of the neutron scattering spectrometer, and has a very important influence on the performance of the neutron scattering spectrometer. Such as figure 1 As shown, the upper plate 1 and the lower plate 2 are made of materials that can absorb neutrons. above) thermal neutrons are absorbed. Among them, L indicates the collimation length, d indicates the width of the transmission zone, α ind...

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Problems solved by technology

However, the original Soller type neutron collimator used stainless steel sheet as the carrier layer of neutron-absorbing material, and coated the stainless steel sheet with neutron-absorbing material such as Cd, etc., due to the thicker stainless steel sheet, the neutron transmittance It is also very difficult to stretch and flatten, and the production is very difficult, and the thermal expansion and contraction of the material will also cause deformation and affect the quality of the neutron collimator

Now some Soller neutron collimators use plastics (such as Mylar film, etc.) to spray neutron absorbing materials as separators, which simplifies the manufacturing process and reduces the cost. However, the life of plastic coating films such as Mylar film is relatively short Short, poor anti-radiation aging ability, generally can not be used as the first neutron collimator, and the service life under irradiation conditions is generally only a few years, resulting in the need to frequently replace new neutron collimators to ensure neutron scattering Performance of the spectrometer

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