GB/T 35389-2017 in English

GB/T 35389—2017: In-depth analysis and application of X-ray digital imaging detection technology

Standard Overview

GB/T 35389—2017 "Guidelines for X-ray Digital Imaging for Nondestructive Testing" provides comprehensive technical guidance for X-ray digital imaging detection technology, including key contents such as detection principles, equipment composition, image characteristics analysis and quality assessment.

Comparison of standard frameworks

The following table compares the key dimensions of GB/T 35389-2017 with other relevant standards:

Dimensions	GB/T 35389-2017	GB/T 35394-2017	GB/T 35388-2017
Technical features	X-ray digital imaging detection technology principles and image processing methods	System characteristics measurement and analysis	Detection method specifications
Detection equipment	Equipment composition and performance requirements of X-ray sources, detectors, mechanical devices, etc.	Measurement and analysis of system characteristics	Specification of detection methods
Image quality assessment	Definition and measurement methods of indicators such as resolution, signal-to-noise ratio, and contrast-to-noise ratio	Measurement and analysis of system characteristics	Specification of detection methods

Technical characteristics and principles

X-ray digital imaging technology uses the penetrating characteristics of X-rays to receive the transmitted ray signals using the detector and convert them into digital images. Its core steps include three stages: transillumination, signal detection and conversion, and image display and evaluation.

Implementation recommendations

1. **Equipment selection**: Select appropriate X-ray sources and detectors according to the material and thickness of the inspection object. For thin-walled welds, it is recommended to use detectors with high resolution and high contrast sensitivity. 2. **Parameter optimization**: Reasonably set the geometric magnification (M) and focal spot size (d) to ensure the best imaging effect. Refer to formula (5) to calculate the optimal geometric magnification: $$ M_{\mathrm{opt}}=1+\left({\frac{a}{d}}\right)^{2} $$ 3. **Quality control**: Regularly calibrate the equipment, evaluate the normalized signal-to-noise ratio (SNRN) and contrast sensitivity (CSa), and ensure that the image quality meets the standard requirements. 4. **Radiation safety**: Strictly abide by national radiation protection regulations, configure appropriate protective devices, and regularly check their effectiveness.