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ISO 32543-3:2026

Non-destructive testing — Characteristics of focal spots in industrial X-ray systems — Part 3: Measurement of the effective focal spot size of mini and micro focus X-ray tubes

Jan 9, 2026

General information

60.60     Jan 9, 2026

ISO

ISO/TC 135/SC 5

International Standard

19.100  

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Scope

This document specifies a method for the measurement of focal spot sizes within the range of 5 µm to 300 µm of X-ray systems up to and including 225 kV tube voltage. This determination is based on the evaluation of an image with a dedicated focal spot that has been radiographically recorded using an edge and evaluated with a digital method.
The imaging quality and the resolution of X-ray images depend highly on the characteristics of the effective focal spot, in particular its size and the two-dimensional intensity distribution as seen from the detector plane.
For the characterization of commercial X-ray tube types (i.e. for advertising or trade), the nominal values of Annex A are preferred.
NOTE            The same procedure can be used at higher kilovoltages by agreement but the accuracy of the measurement can be poorer.

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PUBLISHED
ISO 32543-3:2026
60.60 Standard published
Jan 9, 2026

National adoptions

dnaSRPS EN ISO 32543-3:2023  
ISS

Non-destructive testing - Characteristics of focal spots in industrial X-ray systems - Part 3: Measurement of the effective focal spot size of mini and micro focus X-ray tubes (ISO/FDIS 32543-3:2025)

50.60   Close of voting. Proof returned by secretariat

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