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GA/T 1939-2021 English PDF

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GA/T 1939-2021: Forensic sciences - Examination methods for electric marks - Scanning electron microscopy/energy dispersive X-ray spectrometry
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GA/T 1939-2021	English	299	Add to Cart	3 days [Need to translate]	Forensic sciences - Examination methods for electric marks - Scanning electron microscopy/energy dispersive X-ray spectrometry	Valid	GA/T 1939-2021

PDF similar to GA/T 1939-2021

Standard similar to GA/T 1939-2021

GA/T 1788.2 GA/T 1711 GA/T 424 GA/T 1930 GA/T 1931 GA/T 1929

Basic data

Standard ID	GA/T 1939-2021 (GA/T1939-2021)
Description (Translated English)	Forensic sciences - Examination methods for electric marks - Scanning electron microscopy/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	13,177
Date of Issue	2021-10-14
Date of Implementation	2022-05-01
Issuing agency(ies)	Ministry of Public Security

GA/T 1939-2021: Forensic sciences - Examination methods for electric marks - Scanning electron microscopy/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 electric marks - Scanning electron microscopy/energy dispersive X-ray spectrometry ICS 13.310 CCSA92 People's Republic of China Public Security Industry Standards Forensic Science Spot Test 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. Jiangsu Provincial Public Security Department Evidence Appraisal Center, Ministry of Public Security Evidence Appraisal Center, Jiangsu Police Academy. The main drafters of this document. Chen Jin, Quan Yangke, Wang Jun, Jin Xiaodong, Zhang Fei, Yang Ben. Forensic Science Spot Test Scanning Electron Microscopy/X-ray Spectroscopy

1 Scope

This document specifies a scanning electron microscope/X-ray spectrometer inspection method for current spots in the field of forensic science. This document is applicable to metal element composition inspection, metal particle morphology inspection, and metal element composition ratio of electric spot skin in the field of forensic science For inspection, other fields can also refer to it.

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. GA/T 242 Physicochemical Examination Terminology for Trace Evidence in Forensic Science

3 Terms and Definitions

The following terms and definitions defined in GA/T 242 apply to this document. 3.1 Electric spot electricmark It is a kind of skin injury formed at the contact point between the conductor and the skin due to Joule heat and electrolysis when the current passes through the skin. 3.2 electric marks skin electricmarkskin Skin damaged by electric current. 3.3 Blank control skin blankcontrolskin Normal skin that has not been damaged by electric current.

4 principles

The metal element composition of the current spot skin and the morphology and element composition of the metal particles in the current spot skin can be examined by scanning electron microscope/ The magnification and selection analysis functions of the X-ray energy spectrometer are tested. Through further inspection of the metal conductor comparison sample, the current can be judged Whether the element types of the spot skin and the metal conductor comparison samples are the same, and whether there is a significant difference in the relative content of each element. See Appendix A for the formation mechanism of current spots and skin metallization, and the evidence value analysis of test results. Photo of metal particles in the skin of electric current spots See Appendix B for slices and X-ray spectrograms.

5 Instruments and materials

Instruments, equipment and materials include.

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