Gamma radiography is an important tool in non - destructive testing (NDT) on construction sites and remote locations. Main applications are weld inspection on oil and gas pipelines, power plants and as well as in chemical and petrochemical production sites. Gamma radiography is a very economical and at the same time safe process to ensure operational safety of inspected assemblies resulting in better protection of human health and environment. Gamma radiography completes the full range of modern NDT applications. Where other methods are not possible due to lack of electricity in the field, gamma radiography can full fill this requirement. Easy positioning of the very small focus spot and short preparation time are also advantages of the use of radionuclide in NDT.
The most common radionuclide used in industrial radiography are Co-60, Ir-192, Se-75 and Yt-169. On account of the hard energy range the use of Co-60 is limited to a big wall thickness of steel and concrete up to 150 mm. For less thickness material the use of other mentioned radionuclide are more suitable.
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