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A method for measuring the size change behavior of nuclear graphite under irradiation environment using ion beam irradiation

A technology of size change and irradiation environment, which is applied in the direction of material analysis, measuring devices, and instruments using wave/particle radiation, can solve the problems of long cycle and high cost of measurement methods, and achieve short cycle, good application prospects, and low cost Effect

Active Publication Date: 2021-08-06
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the dimensional change behavior of nuclear graphite in an irradiation environment by using ion beam irradiation, thereby solving the problem of measuring the dimensional change behavior of nuclear graphite in a material test pile in the prior art Problems of high cost, long period, and need for supporting facilities such as hot chambers

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  • A method for measuring the size change behavior of nuclear graphite under irradiation environment using ion beam irradiation
  • A method for measuring the size change behavior of nuclear graphite under irradiation environment using ion beam irradiation

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Embodiment 1

[0024] In this embodiment, the nuclear graphite sample is processed into a thin sheet of 5×2×0.1 mm, the sample is installed at the end of the accelerator and one end of the sample is fixed, and the temperature of the sample is controlled at 350° C. and 650° C. respectively. Then, the sample was irradiated with a silver ion beam of 10 MeV, and the irradiation dose was 5×10 15 ,1×10 16 ,2×10 16 ,5×10 16 ion / cm 2 , after the end of the irradiation, use a surface profiler to measure the relationship curve between the surface curvature of the sample and the dose (such as figure 1 shown). The sample structure model is established by the finite element method, and the curvature of the sample is calculated as the strain at different positions inside the sample. The strain is the size change of nuclear graphite at the temperature and the radiation dose; by changing the radiation dose and the radiation temperature, the relationship curve between the size change and the radiation d...

Embodiment 2

[0026] The process of this embodiment is basically the same as that of Embodiment 1, the only difference is that the sample size is 5×2×0.05 mm, and the ion beam is a 10 MeV argon ion beam.

[0027] In this embodiment, the radiation size change behavior test can be performed on the nuclear graphite with a smaller particle size.

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Abstract

The invention provides a method for measuring the dimensional change behavior of nuclear graphite in an irradiation environment by using ion beam irradiation, comprising the following steps: 1) being beneficial to ion beam irradiation of a nuclear graphite sample of a certain size, so that the irradiated nuclear graphite The shape of the sample changes; 2) measure the shape change, and use the performance characteristics of the nuclear graphite sample to calculate the size change of the nuclear graphite sample under the irradiation environment by mathematical methods; and 3) by controlling the change of the ion beam irradiation dose, And repeat the above process to obtain the size change behavior curve of the nuclear graphite sample under the irradiation environment. The method provided by the present invention has the advantages of low cost and short period compared with the method of testing in the material test pile, and can be used to optimize the production raw materials and process in the nuclear graphite research and development process, and can also be used as a quality control method for nuclear graphite. It can be used as a means of sampling and analyzing graphite core samples of active reactors, and has high economic value and good application prospects.

Description

technical field [0001] The invention relates to the field of material testing, in particular to a method for measuring the size change behavior of nuclear graphite in an irradiation environment by using ion beam irradiation. Background technique [0002] Nuclear graphite is an important nuclear energy material. Due to its excellent neutron moderation performance, it is used as moderator material and scatterer material in various reactors, and its cost accounts for a large part of the reactor construction cost. During the service in the reactor, nuclear graphite will undergo dimensional changes due to the irradiation of fast neutrons in the reactor. This dimensional change behavior is directly related to the safety and life of the reactor. Therefore, measuring the size change behavior of nuclear graphite under irradiation environment is an important content of the development of nuclear graphite. The current test method is to place nuclear graphite samples in a material test...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/00
Inventor 贺周同周兴泰
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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