Radiographic testing (RT) is an imaging technique that uses X-rays, gamma rays, or other ionising radiation and non-ionising radiation to visualise an object’s internal structure. This article delves into RT’s basic concepts and several benefits of radiographic testing. Read on to know more!
What is Radiographic Testing?
Radiographic testing (RT) is an NDT method that examines the inside structure of manufactured components to find any flaws or problems.
The test component in radiography testing is positioned between the radiation source and the film (or detector).
Its material density and thickness variations will lessen the penetrating radiation through interaction mechanisms involving scattering and/or absorption. Then, the variations in absorption will be captured on film or with an electronic device such as a computer.
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Types of Radiographic Testing
Conventional radiography exposes flaws by utilising a sensitive (silver halide) film that responds to the radiation emitted. Its main drawbacks are that the films can only be used once and that processing and interpretation require a lot of time.
Digital radiography uses a digital detector to produce images within a shorter exposure time compared to conventional radiography. As such, technicians are able to detect material flaws and defects in a system, examine weld repairs, and check insulation for corrosion thanks to its ability to take high-quality photos.
Below are the four main types of digital radiography:
- Computed Radiography (CR)
CR replaces conventional X-ray films with reusable phosphor imaging plates. While admittedly slower than direct radiography, this method is substantially faster than film radiography.
- Direct Radiography (DR)
DR is quite similar to computed radiography, and the main difference is how the picture is taken. In DR, an image is directly captured by a flat panel detector and shown on a computer screen.
Since DR is quicker and produces images of higher quality, this method is a bit expensive.
- Real-Time Radiography (RTR)
With RTR, radiation takes place in real-time and is emitted through an object. Then, these beams engage with a unique phosphor screen or a flat panel detector with electronic sensors.
However, images produced by RTR are typically lower in quality— limited resolution, poor lighting, and uneven sharpness.
- Computed Tomography (CT)
CT reduces human error and develops accurate images. There are two techniques to implement CT in an industrial setting:
- The component examined must remain stationary while the X-ray detector and radiation source spin around it (usually for large components)
- The component examined is rotated around the X-ray detector and radiation source (usually for small components or components with complicated shapes)
Radiographic Testing Benefits
Here are some of the best radiographic testing benefits:
- Easy checking and monitoring of assembled components
- Provides a detailed and permanent record of the examination
- Detects both surface and subsurface defects or flaws
- Sample can be inspected without sectioning
- Adaptable and flexible for a range of materials
- Minimal preparation and rapid test results
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Top-Notch Radiographic Testing Services in Malaysia
Your success is our ultimate goal. At Xpert Engineering, we always strive to provide unmatched inspection services for our clients. We offer professional radiographic testing services to deliver a myriad of radiographic testing benefits.