ISO 32543-2:2026

Overview

ISO 32543-2:2026 – Non-destructive testing - Characteristics of focal spots in industrial X-ray systems - Part 2: Edge method with hole or disk type test objects – specifies a reliable method for measuring effective focal spot sizes larger than 0.2 µm in industrial X-ray systems. Utilizing the edge method, this standard employs digital imaging of hole or disk type test objects where no phase contrast is observed. Assessing focal spot size and its two-dimensional intensity distribution is critical for image quality and resolution in non-destructive testing (NDT) applications. ISO 32543-2:2026 is especially relevant when other techniques, such as the pin hole method described in ISO 32543-1, are impractical.

Key Topics

• Edge Method Measurement: Outlines procedures for obtaining effective focal spot dimensions using edge unsharpness analysis from digital images of hole or disk test objects.
• Test Objects: Details requirements for test objects (holes/disks), including diameter tolerances and material specifications to ensure accurate imaging for focal spot evaluation.
• Digital Imaging Requirements:
  • Support for computed radiography (imaging plates)
  • Digital detector arrays (DDA) with suitable pixel size and calibration
  • Image processing and validated software for automated evaluation
• Measurement Procedure:
  • Capturing and analyzing linearized image profiles
  • Applying specific threshold values (50%–84%) to determine edge unsharpness, corrected for detector resolution
  • Calculating effective focal spot size with attention to geometric magnification
• Accuracy Considerations: Acknowledges that, if using commercial ASTM hole plate image quality indicators (IQIs), accuracy is influenced by ±10% manufacturing tolerances.
• Long-term Monitoring: Enables ongoing checks of focal spot stability and performance without the need for a pin hole camera.

Applications

ISO 32543-2:2026 is essential for professionals and organizations involved in non-destructive testing, radiographic inspection, and quality assurance of industrial X-ray systems. Key application areas include:

• Industrial Radiographic Testing: Continuous monitoring of X-ray tube performance to ensure high-resolution imaging for detecting flaws or inconsistencies in materials and structures.
• Equipment Calibration and Maintenance: Allows operators to verify and track X-ray focal spot characteristics over time, ensuring assessment reliability.
• Manufacturing of X-ray Tubes: Offers manufacturers a user-friendly method to classify and document focal spot sizes, particularly when lower-tolerance test objects are used.
• Field and Laboratory Settings: Ideal for environments where space or practical limitations prevent use of the pin hole method.
• Product Certification and Compliance: Supports consistent documentation of focal spot performance for regulatory, advertising, or trade purposes.

Related Standards

For comprehensive focal spot evaluation and radiographic system quality assessment, the following standards are directly related to ISO 32543-2:2026:

• ISO 32543-1: Non-destructive testing - Characteristics of focal spots in industrial X-ray systems - Part 1: Pin hole method
• ISO 32543-3: Focuses on measurement techniques for mini- and microfocus X-ray tubes
• ISO 16371-1: Classification of digital computed radiography systems
• ISO 19232-5: Determination of image unsharpness and basic spatial resolution using duplex wire-type IQIs
• ASTM E1025 & ASTM E1742: Specifications for plate hole image quality indicators
• ASTM E2903: Measurement procedures for microfocus X-ray spot size

Conclusion

ISO 32543-2:2026 provides a practical and effective methodology for measuring and monitoring focal spot sizes in industrial X-ray systems, directly supporting improved image quality and process reliability in non-destructive testing. This standard is vital for NDT professionals, X-ray equipment manufacturers, and quality assurance teams committed to maintaining high standards for industrial radiography systems.