GB/T 23901.2-2019 English PDF (GBT23901.2-2019)

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GB/T 23901.2-2019: Non-destructive testing -- Image quality of radiographs -- Part 2: Determination of the image quality value using step/hole-type image quality indicators
GB/T 23901.2-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
J 04
GB/T 23901.2-2019 / ISO 19232-2:2013
Replacing GB/T 23901.2-2009
Non-destructive testing - Image quality of radiographs
- Part 2: Determination of the image quality value
using step/hole-type image quality indicators
(ISO 19232-2:2013, IDT)
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: JANUARY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Specification for step/hole-type image quality indicators ... 6 
5 Use of image quality indicators ... 10 
6 Determination of image quality value ... 10 
Foreword
GB/T 23901 “Non-destructive testing - Image quality of radiographs” is divided
into 5 parts:
- Part 1: Determination of the image quality value using wire-type image
quality indicators;
- Part 2: Determination of the image quality value using step/hole-type image
quality indicators;
- Part 3: Image quality classes;
- Part 4: Experimental evaluation of image quality values and image quality
tables;
- Part 5: Determination of the image quality unsharpness and basic spatial
resolution value using duplex wire-type image quality indicators.
This Part is Part 2 of GB/T 23901.
This Part is drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 23901.2-2009 “Non-destructive testing - Image quality
of radiographs - Part 2: Image quality indicators (step/hole type) - Determination
of image quality value”. As compared with GB/T 23901.2-2009, the main
changes are as follows:
- Modify normative references (See Clause 2; Clause 2 of the 2009 edition);
- Modify terms and definitions (See Clause 3; Clause 3 of the 2009 edition);
- CHANGE the expression in Chinese of “Image quality of radiographs”
[Translator note: There is another expression for “Image quality of
radiographs” in Chinese];
- CHANGE the expression in Chinese of “image quality value” [Translator
note: There is another expression for “image quality value” in Chinese];
- CHANGE “film” to “detector”.
This Part, using translation method, is identical to ISO 19232-2:2013 “Non-
destructive testing - Image quality of radiographs - Part 2: Determination of the
image quality value using step/hole-type image quality indicators”.
The documents of China which have a consistent correspondence with the
international documents normatively referenced in this Part are as follows:
- GB/T 19802-2005 Non-destructive testing - Industrial radiographic
illuminators - Minimum requirements (ISO 5580:1985, IDT)
- GB/T 23901.4-2019 Non-destructive testing - Image quality of radiographs
- Part 4: Experimental evaluation of image quality values and image quality
tables (ISO 19232-4:2013, IDT)
- GB/T 27050.1-2006 Conformity assessment - Suppliers declaration of
conformity - part 1: General requirements (ISO/IEC 17050-1:2004, IDT)
This Part was proposed by and shall be under the jurisdiction of National
Technical Committee 56 on Non-destructive Testing of Standardization
Administration of China (SAC/TC 56).
Responsible drafting organizations of this Part: Shanghai Institute of Space
Propulsion; Shanghai Aerospace Power Technology Engineering Co., Ltd.;
Shanghai Research Institute of Materials; Zhejiang Jinyun IQI. Co.; Hubei
Sanjiang Space Jiangbei Machinery Engineering Co., Ltd.; Matrix Science and
Industry Testing Technologies (Beijing) Co., Ltd.; Shanghai Spaceflight
Precision Machinery Institute; Shanghai Institute of Spacecraft Equipment;
Shanghai Aerospace Equipment Manufacturer Co., Ltd.; Sichuan Aerospace
Chuannan Fire Work Technology Co., Ltd.; China Nuclear Power Engineering
Co., Ltd.; Shanghai Feitian Zhongzhi Technology Co., Ltd.; Zhejiang Academy
of Special Equipment Science; Aerospace Research Institute of Materials and
Processing Technology; CITIC Dicastal Co., Ltd.; Shanghai Acoustics
Laboratory, Chinese Academy of Sciences; Ningbo Special Equipment
Inspection and Research Institute; Shanghai Aerospace Control Technology
Institute; NDT Testing Technology (Shanghai) Co., Ltd.
Main drafters of this Part: Chen Yiwei, Xu Guozhen, Jiang Jiansheng, Ding Jie,
Liu Zhanglong, Wang Xiaoyong, Jiang Yunxi, Zhou Jianping, Wei Quan, Sun
Jiangang, Xu Wei, Zhang Zheng, Zhu Congbin, Wang Daolong, Huang Wenda,
Lv Yanda, Yuan Shengping, Liu Jun, Hu Ling, Chen Hu, Yuan Zhizuo, Zhang
Rui, Zhang Yifeng, Zhai Lianna, Ma Jun.
The previous editions of the standard replaced by this Part were released as
follows:
- GB/T 23901.2-2009.
Non-destructive testing - Image quality of radiographs
- Part 2: Determination of the image quality value
using step/hole-type image quality indicators
1 Scope
This Part of GB/T 23901 specifies a device and a method for the determination
of the image quality of radiographs using step/hole-type image quality indicators.
This Part applies to the determination of the image quality value of radiographs
using step/hole-type image quality indicators.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
ISO 5580 Non-destructive testing - Industrial radiographic illuminators -
Minimum requirements
ISO/IEC 17050-1 Conformity assessment - Supplier’s declaration of
conformity - Part 1: General requirements
ISO 19232-4 Non-destructive testing - Image quality of radiographs - Part 4:
Experimental evaluation of image quality values and image quality tables
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Image quality
Characteristic of a radiographic image which determines the degree of detail it
shows.
3.2 Image quality indicator; IQI
Device comprising a series of wires or steps with holes of graded dimensions