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GB/T 38944-2020: Non-destructive testing - Testing method of small-angle neutron scattering
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Non-destructive testing - Testing method of small-angle neutron scattering
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GB/T 38944-2020
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Basic data | Standard ID | GB/T 38944-2020 (GB/T38944-2020) | | Description (Translated English) | Non-destructive testing - Testing method of small-angle neutron scattering | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 19.100 | | Word Count Estimation | 22,256 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2020-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 38944-2020: Non-destructive testing - Testing method of small-angle neutron scattering---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Non-destructive testing - Testing method of small-angle neutron scattering
ICS 19.100
J04
National Standards of People's Republic of China
Non-destructive testing neutron small angle scattering detection method
2020-06-02 release
2020-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Contents
Foreword Ⅲ
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Symbol 2
5 Method summary 2
6 Testing system and equipment 3
7 Spectrometer preparation 4
8 Sample testing 5
9 Data processing 8
10 Test report 11
Appendix A (Normative Appendix) Calibration of the detector 12
Appendix B (Normative Appendix) Absolute Scattering Intensity Correction 13
Appendix C (Normative Appendix) Spectrometer Resolution 14
Appendix D (Normative Appendix) Error Analysis 16
Reference 17
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is proposed and managed by the National Non-destructive Testing Standardization Technical Committee (SAC/TC56).
This standard was drafted by. Institute of Nuclear Physics and Chemistry, Chinese Academy of Engineering Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences,
Shanghai Institute of Materials Science, University of Science and Technology of China, Institute of High Energy Physics, Chinese Academy of Sciences, China Academy of Atomic Energy, Shanghai Jiaotong University
Institute of Metal Research, Chinese Academy of Sciences.
The main drafters of this standard. Yan Guanyun, Chen Jie, Chen Bo, Sun Guangai, Huang Chaoqiang, Liu Dong, Qian Dazhi, Liu Yaoguang, Gong Jian, Men Yongfeng, Ding Jie,
Li Liangbin, Cheng He, Wang Fangwei, Li Tianfu, Zhong Shengyi, Cai Guixi.
Introduction
Small angle neutron scattering is caused by structural inhomogeneities in the nanometer to submicron scale in the sample and is located near the incident neutron beam (usually less than
10°) coherent scattering. The neutron small angle scattering test refers to measuring the coherent scattering signal near the incident neutron beam using a neutron small angle scattering spectrometer,
And data processing and analysis, in order to obtain the nano-submicron scale structure information inside the sample test method, typical measurable structure contains
Precipitated phases, bubbles in metal samples, holes in ore samples, ceramics, polymers, and aggregates in solution samples, etc.
The second-phase particles are used in the standard to refer to the above-mentioned characteristic structure. The neutron small angle scattering test can give the content, size distribution and ratio of the second phase particles
The surface area and other information can also analyze the shape of the second phase particles under specific conditions. With the construction of large-scale neutron scattering research facilities in my country and
Development, the user group for research work with the help of neutron small angle scattering experiments will continue to expand, so the development of relevant non-destructive testing methods can be used for inspection
Provide technical specifications for measuring the second phase particles in the sample.
The data obtained by the neutron small angle scattering test is reciprocal space information, and the second phase of the sample in real space can be given by data inversion analysis
The structural information of particles, its data analysis and interpretation are often combined with other observation methods such as scanning electron microscope, transmission electron microscope, atomic force microscope, etc.
use.
Non-destructive testing neutron small angle scattering detection method
Warning-This standard does not involve any security issues, even if there is any content in this regard, it is related to its application. Safety of use
And healthy behavior norms are established by users of this standard, and should be observed when using this standard.
1 Scope
This standard specifies the detection of second-phase particles (micropores, precipitated phases,
Fillers, etc.) Size distribution, content and specific surface area.
This standard applies to statistically isotropic sparse sample systems with a second phase particle size in the nanometer to submicron range. This standard applies
For the detection of solid samples such as metals, ceramics, polymers, minerals, etc., for liquid samples, refer to the implementation.The appropriate sample thickness is about 0.5mm~
10mm (for example, polymer samples are about 0.5mm~3mm, ceramics and minerals are about 0.5mm~5mm, commonly used metal materials are about 0.5mm~
10mm).
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 12604.8 Non-destructive testing term neutron testing
GB/T 12604.11 Non-destructive testing term X-ray digital imaging testing
GB/T 26140 neutron diffraction method for measuring residual stress by nondestructive testing
GB/T 30705 Microbeam analysis electronic probe microanalysis spectroscopy experimental parameter determination guide
GB/T 36053 X-ray reflection method for measuring film thickness, density and interface width Instrument requirements, collimation and positioning, data acquisition
Collection, data analysis and reporting
3 Terms and definitions
GB/T 12604.8, GB/T 26140, GB/T 12604.11, GB/T 36053, GB/T 30705 and the following terms and
The definition applies to this document.
3.1
Sparse system
The concentration of the particles to be measured is low (such as metals and polymer materials with a volume ratio of the second phase within 1%), and the interaction between particles can be
Ignore the system.
3.2
Neutron scattering length
The probability that a neutron is scattered by a nucleus has a dimension of length.
3.3
Neutronscatteringlengthdensity
The total probability of all atoms in the unit volume interacting with neutrons and scattering, which is equal to the neutron scattering length of all atoms in the unit volume
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