[2C4] Radiography and digital over 25 years… in stories and pictures
J McNab
Oceaneering International Services Ltd, UK
In the proposed presentation, Jim McNab will discuss his 50 years of technical experience working with radiography, a well-established NDT method that uses gamma or X-rays to produce an image of an object onto film. However, radiography using digital detection media has evolved as the preferred method, replacing conventional film for certain applications, especially for pipe corrosion-type flaws, but its introduction has opened a much wider range of lesser-known applications.
Jim will mention the benefits of removing developing time and chemicals, including improving inspection efficiency, reducing the impact on the environment and being able to view radiographs digitally, allowing ‘remote’ interpretation and reporting with dedicated analysis software. Digital detectors have vastly superior ‘exposure latitude’ or ‘dynamic range’ over film, increasing the probability of detection from a single exposure and helping with the accuracy of sizing flaws.
The presentation will also explore the suitability of digital capture media related to high- and low-energy X-rays and the most common radioisotopes, such as Ir-192 (iridium) and Se-75 (selenium).
Radiography image examples with associated ‘stories’ covering Jim’s 50-year career will supplement and enlighten the audience, with oil & gas-related examples alongside more unique samples from government buildings, railway lines, nuclear facilities and even from deepwater to space.
Jim will mention the benefits of removing developing time and chemicals, including improving inspection efficiency, reducing the impact on the environment and being able to view radiographs digitally, allowing ‘remote’ interpretation and reporting with dedicated analysis software. Digital detectors have vastly superior ‘exposure latitude’ or ‘dynamic range’ over film, increasing the probability of detection from a single exposure and helping with the accuracy of sizing flaws.
The presentation will also explore the suitability of digital capture media related to high- and low-energy X-rays and the most common radioisotopes, such as Ir-192 (iridium) and Se-75 (selenium).
Radiography image examples with associated ‘stories’ covering Jim’s 50-year career will supplement and enlighten the audience, with oil & gas-related examples alongside more unique samples from government buildings, railway lines, nuclear facilities and even from deepwater to space.
