Radiographic Testing. (RT).

Radiographic testing (RT), also known as industrial radiography, is a Non-Destructive Testing (NDT) method that uses

X-rays or Gamma Rays to examine the internal structure of materials and detect flaws or defects.​

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• How it works:

  • A radiation source (X-ray generator or radioactive isotopes) emits radiation that passes through the material being tested. 

  • The material's density and thickness variations affect the amount of radiation that passes through, creating a shadow-like image on a detector (film or digital sensor). 

  • The resulting image reveals internal features, defects, and variations in the material's structure. 

• Applications:

  • Radiographic testing is used in various industries, including aerospace, power generation, manufacturing, and oil and gas, to inspect welds, castings, forgings, and other components. 

  • It's particularly useful for detecting internal flaws like cracks, porosity, inclusions, and lack of fusion. 

• Benefits:

  • Non-destructive: The material being tested is not damaged during the process. 

  • Permanent record: The radiographic image provides a visual record of the inspection results. 

  • Versatile: Can be used on a wide range of materials and components. 

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• Types of Radiography:

  • Film Radiography: Uses X-ray film to capture the image. 

  • Digital Radiography (DR): Uses digital detectors to capture the image. 

  • Computed Radiography (CR): Uses a special film that is scanned to create a digital image. 

  • Real-time Radiography (RTR): Allows for live viewing of the image during the inspection. 

  • Computed Tomography (CT): Creates 3D images of the object by combining multiple 2D images. 

• Safety:

  • Because of the use of ionizing radiation, strict safety protocols must be followed during radiographic testing. 

  • Operators must be trained and certified in radiation safety. 

  • Shielding and monitoring equipment are used to minimize radiation exposure. 

• All RT Candidates are expected to also undertaker Radiation safety Training, as well as the appropriate exams.

• Click here for more information on Radiation Safety Training. 

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