Gamma-Ray Radiographic Testing
Gamma radiography uses radioactive isotopes to detect internal inhomogeneities and weld defects in thick-walled metal parts. It records intensity differences that indicate material defects.
Physical-Chemical Mechanism of Action
Radiographic testing uses gamma rays emitted by radioactive isotopes. These rays penetrate the metal and are absorbed or scattered at material boundaries. The intensity of surviving rays is recorded.
Metallurgical Relevance & Welding Risks
This test is especially useful for thick-walled components because it detects internal defects and weld flaws not visible by optical methods. Incorrect interpretation of results can lead to inaccurate conclusions, posing risks in construction.
Workshop Practice & Procedures
For a correct radiographic test, it's important to:
• Choose the right radiation source (e.g., Cobalt-60) based on wall thickness.
• Position the metal properly to ensure uniform testing conditions.
• Regulate radiation intensity and exposure time accurately to get sharp, reliable images.