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GA/T 1938-2021: Forensic sciences - Examination methods for metal - Scanning electron microscope/energy dispersive X-ray spectrometry
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| GA/T 1938-2021 | English | 189 |
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Forensic sciences - Examination methods for metal - Scanning electron microscope/energy dispersive X-ray spectrometry
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GA/T 1938-2021
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Basic data | Standard ID | GA/T 1938-2021 (GA/T1938-2021) | | Description (Translated English) | Forensic sciences - Examination methods for metal - Scanning electron microscope/energy dispersive X-ray spectrometry | | Sector / Industry | Public Security (Police) Industry Standard (Recommended) | | Classification of Chinese Standard | A92 | | Classification of International Standard | 13.310 | | Word Count Estimation | 8,855 | | Date of Issue | 2021-10-14 | | Date of Implementation | 2022-05-01 | | Issuing agency(ies) | Ministry of Public Security | GA/T 1938-2021: Forensic sciences - Examination methods for metal - Scanning electron microscope/energy dispersive X-ray spectrometry
---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.
Forensic sciences - Examination methods for metal - Scanning electron microscope/energy dispersive X-ray spectrometry
ICS 13.310
CCSA92
People's Republic of China Public Security Industry Standards
Forensic Science Metal Testing
Scanning Electron Microscopy/X-ray Spectroscopy
Released on 10-14-2021
2022-05-01 implementation
Released by the Ministry of Public Security of the People's Republic of China
Published by China Standard Press
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"
drafting.
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
This document was proposed by the National Criminal Technology Standardization Technical Committee Physical and Chemical Inspection Sub-Technical Committee (SAC/TC179/SC4) and submitted
Focus on.
This document was drafted by. Criminal Technology Corps of Liaoning Provincial Public Security Department, China Criminal Police Academy, and Physical Evidence Appraisal Center of the Ministry of Public Security.
Drafters of this document. Ding Feng, Zhang Zhenyu, Shi Huixia.
Forensic Science Metal Testing
Scanning Electron Microscopy/X-ray Spectroscopy
1 Scope
This document specifies the method for examining the elemental composition of metal evidence by scanning electron microscope/X-ray energy spectrometer in the field of forensic science.
This document is applicable to the elemental composition analysis and comparative inspection of metal evidence in the field of forensic science, and can also be used as a reference in other fields.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document.
GB/T 14666 Analytical Chemistry Terminology
GA/T 242 Physicochemical Examination Terminology for Trace Evidence in Forensic Science
3 Terms and Definitions
The terms and definitions defined in GB/T 14666 and GA/T 242 apply to this document.
4 principles
Except for lithium and beryllium, the common metal elements in nature are all within the detection range of scanning electron microscope/X-ray energy spectrum analysis method. answer
A scanning electron microscope/X-ray energy spectrometer can be used to obtain the energy spectrum of the characteristic X-rays of each element in the metal sample;
The position and intensity of the peak can be used for qualitative and semi-quantitative analysis of the contained elements. See Appendix A for common metal evidence and its main components.
5 Instruments and materials
Instruments, equipment and materials include.
a) scanning electron microscope (SEM);
b) X-ray energy spectrometer (energy spectrometer), detection range B5~U92, resolution (MnKα) higher than 150eV;
c) optical stereo microscope;
d) sample stage with conductive adhesive surface;
e) Scalpels, tweezers, diamond drill bits, diamond files;
f) Sandpaper, emery cloth, grinding wheel (all above.200 mesh);
g) polishing agent;
h) Ethanol (C2H6O, analytical or chromatographically pure), deionized water.
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