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GB/T 23901.4-2019 English PDF (GBT23901.4-2019)

GB/T 23901.4-2019 English PDF (GBT23901.4-2019)

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GB/T 23901.4-2019: Non-destructive testing -- Image quality of radiographs -- Part 4: Experimental evaluation of image quality values and image quality tables

GB/T 23901.4-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
J 04
GB/T 23901.4-2019 / ISO 19232-4:2013
Replacing GB/T 23901.4-2009
Non-destructive testing - Image quality of radiographs
- Part 4: Experimental evaluation of image quality
values and image quality tables
(ISO 19232-4:2013, 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 Terms and definitions ... 5
3 Experimental evaluation of image quality values ... 6
4 Determination of image quality tables ... 6
Bibliography ... 8
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 4 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 23901.4-2009 “Non-destructive testing - Image quality of radiographs - Part 4: Experimental evaluation of image quality values and image quality tables”. As compared with GB/T 23901.4-2009, the main changes are as follows:
- Delete normative references (See Clause 2 of the 2009 edition);
- Modify terms and definitions (See Clause 2; Clause 3 of the 2009 edition); - Modify Figure 1 and the corresponding key;
- CHANGE the expression in Chinese of “Image quality of radiographs”
[Translator note: There is another expression for “Image quality of
radiographs” in Chinese].
This Part, using translation method, is identical to ISO 19232-4:2013 “Non- destructive testing - Image quality of radiographs - Part 4: Experimental evaluation of image quality values and image quality tables”.
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).
Drafting organizations of this Part: Shanghai Aerospace Power Technology Engineering Co., Ltd.; Shanghai Institute of Space Propulsion; Shanghai Research Institute of Materials; Zhejiang Jinyun IQI. Co.; Matrix Science and Industry Testing Technologies (Beijing) Co., Ltd.; Hubei Sanjiang Space Jiangbei Machinery Engineering Co., Ltd.; China Nuclear Power Engineering Co., Ltd.; Shanghai Spaceflight Precision Machinery Institute; Shanghai Institute of Spacecraft Equipment; Shanghai Aerospace Equipment
Manufacturer Co., Ltd.; Shanghai Acoustics Laboratory, Chinese Academy of Sciences; Sichuan Aerospace Chuannan Fire Work Technology Co., Ltd.;
Zhejiang Academy of Special Equipment Science; Aerospace Research
Institute of Materials and Processing Technology; Ningbo Special Equipment Inspection and Research Institute; CITIC Dicastal Co., Ltd.; Shanghai
Aerospace Control Technology Institute; NDT Testing Technology (Shanghai) Co., Ltd.
Main drafters of this Part: Xu Guozhen, Chen Yiwei, Jiang Jiansheng, Ding Jie, Liu Zhanglong, Jiang Yunxi, Wang Xiaoyong, Zhu Congbin, Zhou Jianping, Wei Quan, Sun Jiangang, Xu Wei, Hu Ling, Zhang Zheng, Huang Wenda, Lv Yanda, Yuan Shengping, Chen Hu, Liu Jun, 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 23901.4-2009.
Non-destructive testing - Image quality of radiographs
- Part 4: Experimental evaluation of image quality
values and image quality tables
1 Scope
This Part of GB/T 23901 gives instructions for the determination of image quality values and image quality tables.
This Part applies to the experimental evaluation of image quality values and image quality tables during radiographs. If the IQI requirements specified in GB/T 23901.3 cannot be used because, for example, the absorption coefficients of the IQI material and the inspected material differ by more than 30 %, test exposures are necessary to determine acceptance of image quality values. The image quality values achieved by the test exposures are suitable for testing the object under the same radiographic conditions.
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 2.1 Image quality indicator; IQI
Device comprising a series of wires or steps with holes of graded dimensions which enable a measure of the image quality to be obtained.
Note: Image quality indicator may also be expressed in terms of IQI [Translator note: There is additional 1 name in Chinese]. The type of image quality indicator is usually a wire- type or a step/hole-type.
2.2 Image quality
Characteristic of a radiographic image which determines the degree of detail which it shows.
2.3 Image quality value
Measure of the image quality required or achieved and is equal to the finest wire or smallest hole which can be detected on the radiograph.
Note: Image quality value may also be expressed in terms of IQI sensitivity [Translator

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