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Neutron detector and neutron detection method

A technology of a neutron detector and a detection method, which is applied to the measurement of semiconductor detectors, the measurement of neutron radiation, instruments, etc., can solve the problems of poor time resolution and limited counting ability, and achieve high conversion efficiency and counting rate. High, low price effect

Active Publication Date: 2014-10-22
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the process of realizing the present invention, the inventor found that there are at least the following shortcomings in the prior art: most of the existing neutron detectors use high-pressure 3 He gas for neutron detection, however, this based on 3 The intrinsic counting capability of He detection technology is limited (for example, less than 100kHz), and the time resolution of Time of Flight (TOF) is poor, which can no longer meet the needs of the current high-throughput neutron detector development.

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  • Neutron detector and neutron detection method

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Embodiment 1

[0029] figure 1 It is a schematic structural diagram of a neutron detector provided in Embodiment 1 of the present invention. Such as figure 1 As shown, the neutron detector of this embodiment includes a drift electrode 10 for providing a drift electric field, a boron-coated GEM structure 11 for converting incident neutrons, and a primary electron for converting neutrons A GEM structure 12 for gas amplification and a readout electrode 13 for reading out gas-amplified electronic signals. The electric field between the drift electrode 10 and the boron-coated GEM structure 11 is called a drift electric field. The electric field between the GEM structure 12 and the readout electrode 13 is an ordinary electric field, which can be referred to as an electric field for short.

[0030] Such as figure 1 As shown, the drift electrode 10, the boron-coated GEM structure 11, the GEM structure 12 and the readout electrode 13 in this embodiment are arranged parallel to each other and arra...

Embodiment 2

[0042] First of all, it needs to be explained that the detection efficiency is the most important performance index of neutron detectors. For the GEM-based neutron detectors in the above embodiments of the present invention, neutrons are captured by boron to produce 7 Li, α ion, has high energy (~1MeV), and the detection efficiency is basically 100%. Therefore, the neutron detection efficiency can be approximately considered as the conversion efficiency of boron to neutrons. Due to the Coulomb interaction, the pure monolayer 10 The conversion efficiency of B to thermal neutrons is at most about 5%. Such as image 3 Shown is a schematic diagram of the relationship between the neutron conversion efficiency and the number of layers in the embodiment of the present invention. Such as image 3 As shown, the intensity of the neutron beam passing through the conversion layer (that is, the first boron-coated GEM film 14) decays exponentially with the increase in thickness, so the ...

Embodiment 3

[0046] Figure 6 A schematic structural diagram of a neutron detector provided in Embodiment 3 of the present invention. On the basis of the first or second embodiment above, the neutron detector of this embodiment may also include a neutron strike position and The data processing device 16 of the hit time. The data processing device 16 is connected to the readout electrodes 13 . Such as figure 2 shown in the above figure 1 On the basis of the illustrated embodiment, the technical solution of the present invention is introduced by adding the data processing device 16 as an example. Wherein the data processing device 16 may also use existing related hardware to integrate and implement its functions. Specifically, the neutron detection principle of the neutron detector of this embodiment is the same as that of the above-mentioned embodiment, and details can be referred to the description of the above-mentioned embodiment, which will not be repeated here.

[0047] The dete...

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Abstract

The invention provides a neutron detector and a neutron detection method. The neutron detector comprises a drift electrode for providing a drift electric field, a boron-coated gas electron multiplier structure for performing conversion on incident neutrons, a gas electron multiplier structure for performing gas amplification on primary electrons generated after neutron conversion, and a read-out electrode for reading the amplified electronic signals out. The drift electrode, the boron-coated gas electron multiplier structure, the gas electron multiplier structure and the read-out electrode are arranged in parallel and arranged in order. The boron-coated gas electron multiplier structure is formed by at least one cascaded first gas electron multiplier film, and at least one side of the first gas electron multiplier film is coated with a boron layer. The neutron detector of the invention can be used to greatly improve the neutron detection efficiency, has advantages of high counting rate and good time resolution, and can be used to realize time resolution of higher order, and at the same time, the neutron detector has advantages of a gas detector and has advantages of good gamma inhibiting ability, low cost and large-area fabrication.

Description

technical field [0001] The invention relates to neutron detection technology, in particular to a neutron detector and a neutron detection method. Background technique [0002] With the improvement of the performance of the new generation of neutron science devices, new challenges are put forward for neutron detectors. The neutron beam flux is getting higher and higher, neutron detectors are required to have a high count rate, in order to improve the neutron utilization rate and shorten the measurement time, neutron detectors are required to have high detector efficiency, and the wide spatial range of measurement requires the sensitive area of ​​the detector Larger, higher spectrometer resolution requires detectors with high positional resolution (~mm). [0003] In order to meet the above requirements, most of the existing neutron detectors currently use high-pressure 3 Neutron detection of He gas is mainly divided into two categories: one is the use of multiple position-se...

Claims

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Application Information

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IPC IPC(8): G01T3/00G01T3/08
Inventor 孙志嘉周健荣陈元柏王艳凤杨桂安许虹唐彬杨振
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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