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

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 & 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.