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Method for testing thermal neutron shielding performance of material

A technology for thermal neutron shielding and testing methods, which is applied in the fields of analyzing materials, using radiation for material analysis, and using wave/particle radiation for material analysis, etc., and can solve problems such as uncertainty of test results.

Pending Publication Date: 2022-06-24
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology

The shielding ability characterized by this method is actually the shielding ability of the material to incident neutron beams rather than thermal neutron shielding performance, because the actual neutron beam contains many medium and high energy neutrons above the energy of thermal neutrons, and all thermal neutrons The sub-detectors respond to both medium and high energy neutrons, which leads to a large uncertainty in the test results
For the thermal neutron shielding performance test of materials, there are few relevant researches at present

Method used

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  • Method for testing thermal neutron shielding performance of material
  • Method for testing thermal neutron shielding performance of material
  • Method for testing thermal neutron shielding performance of material

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Embodiment 1

[0118] In this embodiment, the neutron beam used is a moderated isotope neutron source, and thermal neutrons account for about 45%; this embodiment is a test without considering the background, and the selected thermal neutron detector for 3 He proportional counter tube; the schematic diagram of the device during the actual test is shown in Figure 5 . The tested materials in this embodiment are numbered from 1 to 10 respectively, see Table 1 for details.

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Abstract

The invention relates to the technical field of nuclear technology and application, and provides a method for testing thermal neutron shielding performance of a material. According to the invention, by utilizing the characteristics that a thermal neutron region with the neutron absorption cross section within 0.5 eV of cadmium is very large and the cross section is sharply reduced when the neutron absorption cross section exceeds 0.5 eV, thermal neutrons with energy below 0.5 eV are distinguished from other neutrons through two measurements of adding a cadmium sheet shield and not adding the cadmium sheet shield, so that a part contributed by the thermal neutrons in the detector is obtained. The method provided by the invention can realize the accurate test of the thermal neutron shielding performance of the material, and can be directly applied to the thermal neutron shielding performance test of the radiation protection material required in various nuclear-related places such as nuclear power plants, military reactor operation, nuclear material processing and the like.

Description

technical field [0001] The invention relates to the field of nuclear technology and application technology, in particular to a method for testing the thermal neutron shielding performance of materials. Background technique [0002] At present, more and more radioactive sources are used in different places. Neutrons are widely used in nuclear power, neutron radiography, activation analysis, and radiation therapy. The demand for shielding performance testing of neutron irradiation devices is gradually increasing. Advances in materials science have had a dramatic impact on radiation shielding technology over the past decade, and today the thermal neutron shielding performance of many new radiation shielding materials needs to be tested and characterized. [0003] The current shielding performance test method for radiation protection materials is to irradiate the material under test with a neutron beam, and measure the neutron radiation shielding ability by measuring the neutron...

Claims

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Application Information

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IPC IPC(8): G01N23/02
CPCG01N23/025G01N2223/03G01N2223/106Y02E30/30
Inventor 肖海玲文继帅茂兵张宏俊莫钊洪熊忠华
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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