GB/T 35388-2017 in English

《GB/T 35388-2017无损检测 X射线数字成像检测 检测方法》由TC56（全国无损检测标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Foreword

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is developed in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by and is under the jurisdiction of the National Technical Committee on Non-destructive Testing of Standardization Administration of China (SAC/TC 56).



Non-destructive testing -
X-ray digital radiography - Practice

1 Scope

This standard specifies the requirements, technical grades, testing methods, image quality, image evaluation, image management, post-testing processing, record and report of X-ray digital radioscopic testing using the digital detector array.

This standard is applicable to X-ray digital radioscopic testing of metal materials, nonmetal materials, composite materials, and other products. It may be used as a reference to digital radioscopic testing technologies composed of other radiation sources.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 12604.11 Non-destructive testing - Terminology - Terms for X-ray digital radioscopic testing
GB/T 23901.1 Non-destructive testing - Image quality of radiographs - Part 1: Image quality indicators (wire type) - Determination of image quality value
GB/T 23901.2 Non-destructive testing - Image quality of radiographs - Part 2: Image quality indicators (step/hole type) - Determination of image quality value
GB/T 23901.5 Non-destructive testing - Image quality of radiographs - Part 5: Image quality indicators (duplex wire type) - Determination of image unsharpness value
GB/T 30821 Non-destructive testing - Practice for digital imaging and communication
GB/T 35389 Non-destructive testing - X-ray digital radiography - Guide
GB/T 35394 Non-destructive testing - X-ray digital radiography - System properties

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 12604.11 apply.
 
4 Symbols

See Table 1 for symbols used in the standard.

Table 1 Symbols and descriptions
Symbol Description
b Distance from the object surface to the imaging plane of the detector
d Focal spot dimension
F Distance from the focal spot to the detector imaging plane, mm
f Distance from the focal spot to the surface of the tested object, mm
GVmin Minimum allowable gray amplitude
K Ratio of max. and min. penetrated thickness
SNRN Normalized signal to noise ratio
SRb Basic spatial resolution of the detector
〖SR〗_b^i Basic spatial resolution of the image (abbreviated as image resolution)
Uim Image unsharpness

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Testing requirements
6 Technical grade
7 Testing methods
8 Image quality
9 Image evaluation
10 Image management
11 Post-testing processing
12 Records and reports
Annex A (Normative) Image resolution requirements
Annex B (Normative) Image sensitivity requirements