Neutron detector based on boron-conversion multi-stage grid gas

Abstract

The invention discloses a neutron detector based on boron-conversion multi-stage grid gas, wherein the neutron detector can be used for replacing a 3He pipe detector. A boron-plated aluminum strip isused to form multi-layer square pipes, and the aluminum strip is provided with card slots at certain intervals, so that the distance between the square pipes is the distance between the card slots. The card slots on the boron-plated aluminum strip are inserted into a pre-designed aluminum frame, and the center of each unit square pipe is provided with a resistive anode wire. The position in a wiredirection is obtained by a charge distribution method, and the position of the unit pipe determines a lateral position. The layer position where the unit pipe is located gives a longitudinal position, so that it is possible to accurately determine which unit the neutron is detected, thereby achieving three-dimensional detection of neutrons. The detection efficiency of the neutron detection technology which can be used for replacing a 3He pipe is greater than 30%. The thickness of an effective boron neutron conversion layer can be increased through adding the layers of unit square pipes, thereby achieving the improving of the detection efficiency, and reducing the production cost.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, in particular to a 3 A neutron detector based on boron-converted multilevel grid gas for He tube detectors. Background technique [0002] Neutron scattering technology is an ideal probe to study the structure and dynamic properties of matter, and has been widely used in condensed matter physics (solid and liquid), chemistry (especially polymer chemistry), life science, medicine, materials science (especially Nanomaterials science), aviation and national defense construction and many other fields [1]. Compared with X-ray scattering technology, neutron scattering technology has irreplaceable advantages such as extremely strong penetrating ability, sensitivity to light elements, isotopic resolution, and microscopic analysis of magnetic structures. As early as the 1950s, my country used the heavy water research reactor to carry out neutron scattering research. Matter research, t...

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Problems solved by technology

At present, there are roughly five research directions in the world: 1. Based on 6LiF / ZnS(Ag) scintillator: Although the technology can make the thermal neutron detection efficiency greater than 30%, and the position resolution is about 1mm, the gamma suppression ability is low and the cost is high; 2. Based on boron-coated GEM detectors: Although the technology can make thermal neutron detection efficiency greater than 30%, the position resolution is about 3mm, and the area is 100mm×100mm, but the detection area is small; 3. Based on inner-coated boron tube detectors: although the technology It can make thermal neutron detection efficiency about 30%, but the detection efficiency is low; 4. Based on BF 3 Tube: Technology adopts 2atm BF 3 Tube, each single tube is 2m long, and 32 tubes are arranged together to form an array. Although the detection efficiency is about 30%, the detection efficiency is low; 5. Grid gas detector: the technology can make the effective area reach 192cm×8cm, and the pixel 2cm, and the detection efficiency is greater than 40%, it is easy to expand in a large area, the position resolution can be improved, and the overall performance is comparable to that of 3 He detector equivalent

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