Neutron nondestructive detection system

A non-destructive testing, neutron technology, applied in the direction of using radiation for material analysis, etc., can solve the problems of limited thick sample detection, etc., to achieve the effect of convenient practical application and flexible and adjustable position

Inactive Publication Date: 2013-09-04
PEKING UNIV
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Problems solved by technology

Since this method needs to detect the attenuation characteristics of the collimated neutron beam, the neutron source and the exit neutron imaging system must be located on both sides of the detection sample, which limits the use of this method in special requirements and the detection of thick samples

Method used

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  • Neutron nondestructive detection system
  • Neutron nondestructive detection system

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Embodiment Construction

[0018] The biggest difference between neutron self-thermal imaging and existing neutron detection methods is that it can flexibly lay out the position of the neutron source and imaging system. figure 1 with figure 2 The specific implementation is described.

[0019] figure 1 It is a layout diagram of self-thermal imaging using small hole imaging. First, the test sample is placed on the test sample placement device, and the neutron source device and the imaging device are respectively placed on both sides of the sample. The fast neutrons produced by the neutron source are directly incident into the test sample, slowing down the diffusion in the sample, and finally forming a stable thermal neutron distribution in the sample. Where there is a defect, because the material at the defect has a different cross-section for neutrons, the thermal neutron distribution at this point is significantly different from the surrounding thermal neutron distribution. The small hole imaging method...

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Abstract

The invention discloses a neutron nondestructive detection system, which belongs to the field of X-ray nondestructive testing. The system comprise a neutron source, a testing sample placing means, an imaging means and an image processing unit; the neutron source and the imaging means are arranged at a same side or at two opposite sides of the testing sample placing means; the imaging means comprises a diaphragm and a thermal neutron position sensitive detector, the diaphragm is located between the testing sample placing means and the thermal neutron position sensitive detector, and the thermal neutron position sensitive detector is connected with the image processing unit through a data line. Compared to the prior art, the invention has the following advantages: high resolution and high contrast sensitivity nondestructive testing of thick samples can be realized; the position of an imaging system is flexible and adjustable; the neutron nondestructive detection system can realize large scale detection at single irradiation and is convenient for practical application.

Description

Technical field [0001] The invention relates to a neutron nondestructive detection system, in particular to a detection of thick materials on the same side of a neutron source and a detector, belonging to the field of radiation nondestructive detection. Background technique [0002] Neutrons are used for non-destructive testing, mainly based on the changes in the fluence and energy of the emitted neutrons after the incident neutron interacts with the testing material to achieve the detection of the internal structure of the material. Since neutrons are not charged, they mainly interact with atomic nuclei, and their reaction cross sections with different materials vary very irregularly with atomic number, such as hydrogen (H), lithium (Li), boron (B) and other light elements and a few heavy elements. The neutron has a large reaction cross section, and most heavy elements have a smaller reaction cross section to the neutron. Therefore, as a non-destructive testing tool, neutrons c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/05
Inventor 邹宇斌温伟伟唐国有李航
Owner PEKING UNIV
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