GB 22448: Historical versions
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Non-destructive testing instruments - Protection rules for industrial X-ray radiographic equipment below 500kV
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| GB 22448-2008 | 85 |
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Protection rules for industrial X-ray radiographic equipment up to 500kV
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Basic data
Standard ID: GB 22448-2025 (GB22448-2025)
Description (Translated English): Non-destructive testing instruments - Protection rules for industrial X-ray radiographic equipment below 500kV
Sector / Industry: National Standard
Classification of Chinese Standard: N78
Classification of International Standard: 19.100
Word Count Estimation: 10,182
Date of Issue: 2025-08-01
Date of Implementation: 2026-08-01
Older Standard (superseded by this standard): GB 22448-2008
Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China
GB 22448-2025: Non-destructive testing instruments - Protection rules for industrial X-ray radiographic equipment below 500kV
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB22448-2025
ICS 19.100
CCSN78
National Standard of the People's Republic of China
Replaces GB 22448-2008
Non-destructive testing instruments Industrial X-ray below 500kV
Flaw detector protection rules
Released on August 1, 2025
Implementation on August 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 X-ray machine protection requirements 1
5 Protection requirements for X-ray inspection workplaces 2
6 X-ray protection monitoring during use 3
7 X-ray machine safety operation requirements 3
8 X-ray machine radiation protection detection 4
Preface
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.
This document replaces GB 22448-2008 "Protection Rules for Industrial X-ray Flaw Detectors Below 500kV" and is consistent with GB 22448-2008.
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Changed the detailed provisions of the ambient dose equivalent rate caused by leakage radiation (see 4.1, 3.1.1 of the.2008 edition);
--- Deleted the protection requirements for fine structure X-ray machines (see 3.1.2 of the.2008 edition) and the protection requirements for special protection X-ray machines (see
3.1.3 of the.2008 edition) and protection requirements for fully shielded X-ray machines (see 3.1.4 of the.2008 edition);
--- Added protection requirements for X-ray tubes (see 4.2);
--- Changed the protection requirements for "controller" (see 4.3, 3.2.1 of the.2008 edition);
--- Deleted the protection requirements for X-ray output windows (see 3.2.2 of the.2008 edition);
--- Increased requirements for connecting cables (see 4.6);
--- Added protection requirements for X-ray inspection workplaces (see Chapter 5);
--- Changed the area monitoring and management in the use process X-ray protection monitoring (see Chapter 6, 4.2 and 4.3 of the.2008 edition);
--- Deleted the files for X-ray protection (see 5.6 of the.2008 edition);
--- Changed the testing cycle requirements (see 8.2, 6.2.2 of the.2008 edition).
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the Ministry of Industry and Information Technology of the People's Republic of China.
The previous versions of this document and the documents it replaces are as follows.
---First issued in.2008 as GB 22448-2008;
---This is the first revision.
Non-destructive testing instruments Industrial X-ray below 500kV
Flaw detector protection rules
1 Scope
This document specifies the protection requirements for industrial X-ray flaw detectors below 500kV, the protection requirements for X-ray flaw detection workplaces, and the requirements for the use of
Process radiation protection monitoring, X-ray machine safety operation requirements and X-ray machine radiation protection detection, etc.
This document is applicable to industrial X-ray flaw detectors below 500kV (including fixed X-ray flaw detectors, mobile X-ray flaw detectors and
Design, manufacture, installation and use of portable X-ray flaw detectors. Non-destructive testing equipment with the same radiation source range for non-flaw detection purposes shall refer to
use.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB 18871 Basic Standard for Ionizing Radiation Protection and Radiation Source Safety
GB/T 36416.2 Testing machine vocabulary Part 2.Non-destructive testing instruments
3 Terms and Definitions
The terms and definitions defined in GB 18871 and GB/T 36416.2 apply to this document.
4 X-ray machine protection requirements
4.1 Ambient dose equivalent rate caused by X-ray machine leakage
When an industrial X-ray flaw detector (hereinafter referred to as "X-ray machine") below 500kV is working, the main beam window of the X-ray tube should be covered with a light shield.
At the maximum working value specified by the manufacturer, use a protection-grade dose meter to measure the leakage radiation at a distance of 100 cm from the focus of the X-ray tube.
The ambient dose equivalent rate should meet the requirements of Table 1.
Table 1 Ambient dose equivalent rate caused by radiation leakage
Tube voltage U
kV
Ambient dose equivalent rate caused by radiation leakage
mSv/h
U< 150 < 1
150≤U≤200 < 2.5
U >200 < 5
4.2 X-ray tube
4.2.1 The X-ray tube should be able to be fixed in any required position and locked.
......
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