Overview
ISO 19232-1:2013 - Non-destructive testing (NDT) - Image quality of radiographs - Part 1 defines a device and method for determining the image quality value of radiographs using wire-type image quality indicators (IQIs). The standard covers the IQI design (19 wire series), designation, materials, marking, placement on the test object and the method for reading the image quality value on film or digital detectors.
Key topics and requirements
- Scope: Specifies the device and method for image quality assessment using wire-type IQIs; applicable to film and digital detectors (term “detector” replaces “film”).
- IQI system: A series of 19 wires (W1–W19) with defined diameters and tolerances; IQIs are arranged as seven-wire sets covering overlapping ranges (W1–W7, W6–W12, W10–W16, W13–W19). Wire lengths are typically 10 mm, 25 mm or 50 mm.
- Designation and marking: IQIs must be labelled (example: “IQI ISO 19232-1 - W10 FE-25”) and physically marked so the marking does not introduce glare on the radiograph.
- Materials: All wires in an IQI must be the same material; selection should match the absorption characteristics of the test material (see material groups such as CU, FE, TI, AL).
- Placement and arrangement: IQI is normally placed on the side of the specimen facing the radiation source; if placed adjacent to the detector side, an “F” must appear on the radiograph to indicate this arrangement. Choose an area of uniform thickness.
- Image quality value determination: View radiographs under conditions specified in ISO 5580. The image quality value equals the thinnest wire clearly visible (requirement: at least 10 mm continuous visibility).
- Conformity and documentation: IQIs must be supplied with a declaration of conformity per ISO/IEC 17050-1 and be uniquely identified by producer number/mark.
- Compatibility: EN 462-1 IQIs are considered identical; guidance provided for conversion from ASTM E747-04 wire identities (acceptance may require agreement between parties).
Applications and users
ISO 19232-1:2013 is used to ensure consistent radiographic image quality in industrial NDT. Typical users:
- NDT radiographers and inspectors
- Quality managers and inspection engineers in aerospace, oil & gas, power generation, and manufacturing
- Calibration and testing laboratories
- IQI manufacturers and suppliers
Practical applications include routine radiographic quality verification, acceptance testing, process control for welding and castings, and compliance with contractual NDT requirements.
Related standards
- ISO 19232 (parts 2–5) - other IQI types, image quality classes and evaluation methods
- ISO 5580 - radiographic viewing conditions
- ISO/IEC 17050-1 - supplier’s declaration of conformity
- ASTM E747-04 and EN 462-1 - alternate IQI specifications and conversion guidance
Keywords: ISO 19232-1:2013, wire-type IQI, image quality value, radiographs, NDT, radiographic IQI, image quality indicator, ISO 5580, ASTM E747.