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What is the principle behind Radiographic Testing?

Radiographic Testing is based on differential absorption of radiation.

Denser areas absorb more radiation
Thinner or less dense areas allow more radiation to pass through

This creates contrast in the image:

Darker regions → lower density (e.g. porosity, voids)
Lighter regions → higher density material

Planar defects such as cracks may appear as lines depending on their orientation relative to the radiation beam.

Image quality is influenced by:

Source distance
Exposure time
Energy level
Image Quality Indicators (IQI / penetrameters)

How does Radiographic Testing work?
Radiographic Testing works by passing radiation through a material and capturing the resulting image.

A radiation source emits X-rays or gamma rays
The rays pass through the test object
A detector (film or digital panel) captures the transmitted radiation
Variations in material thickness and density form an image
Inspectors analyse the radiograph to identify defects

What equipment is used in Radiographic Testing?

X-ray machine or gamma source
Common isotopes: Iridium-192, Cobalt-60, Selenium-75
Radiographic film or digital detectors (CR/DR systems)
Lead screens and cassettes
Image Quality Indicators (IQI)
Film processing unit or CR scanner
Radiation survey meter

How do you prepare for Radiographic Testing?

Prepare a radiographic technique sheet
Clean the component surface
Position the source and detector correctly
Place IQI on the test object
Establish radiation safety exclusion zones
Calculate exposure parameters (time, distance, energy)
Ensure proper alignment and shielding

How are Radiographic Testing results interpreted?
Radiographs are analysed based on variations in image contrast.

Typical Indications

Dark areas → porosity, voids, inclusions
Linear indications → cracks or lack of fusion (depending on orientation)

Inspection results are:

Compared against standards (ASME, API, AWS)
Stored digitally (e.g. DICOM) or archived as film
Used for reporting and traceability

Data can be recorded, exported, and integrated into inspection reporting systems.

How do you see inside a weld without cutting it open?

Radiographic Testing (RT) makes internal defects visible but interpreting those images accurately is where the real challenge begins.

What is Radiographic Testing?

Radiographic Testing (RT) is a non-destructive testing (NDT) method that uses X-rays or gamma rays to examine the internal structure of a material. It produces an image (radiograph), similar to a medical X-ray, allowing defects to be detected without cutting or damaging the component.

RT is widely used for inspecting welds, castings, and critical components where internal visibility is required.

What is Radiographic Testing used for?

Radiographic Testing (RT) is a non-destructive examination method primarily used to detect internal flaws such as porosity, inclusions, cracks, and other internal discontinuities.
It is considered especially effective for the inspection of welds, the evaluation of castings, and the validation of critical components where structural integrity is paramount.

A key advantage of this process is that RT provides a permanent visual record of the inspection.

Which industries use Radiographic Testing?

Oil & Gas
Petrochemical
Aerospace
Nuclear
Construction

When should you use Radiographic Testing?

Use RT when:

Internal defects need to be clearly visualised
A permanent inspection record is required
Both sides of the component are accessible
Weld quality verification is critical

Avoid RT when:

Radiation hazards are a concern
Material thickness is too high for effective penetration

What are the advantages and limitations of Radiographic Testing?

Advantages

Provides clear internal images
Permanent inspection record
Effective for volumetric defect detection
Suitable for complex geometries

Limitations

Radiation safety risks
Requires controlled environment
Slower due to exposure and processing
Requires access to both sides
Higher operational cost

Working with Radiographic Images?
While RT provides clear internal images, interpreting them accurately and consistently can be challenging.
Tools like AIM support faster interpretation, measurement, and reporting of radiographic data.

Click here to explore AIM

Radiographic TESTING