Which Non-Destructive Examination method uses gamma rays?

The method that uses gamma rays is radiographic testing. This technique involves the use of radiation to create images of the internal structure of a material. Gamma rays, along with X-rays, penetrate the material and expose a film or digital sensor on the opposite side. The resulting images reveal internal flaws, such as cracks or voids, which may not be visible on the surface. Radiographic testing is widely used in various industries to ensure the integrity and safety of materials and structures.

Understanding this method is crucial in applications where safety is paramount, such as in pressure vessels, pipelines, and aerospace components. Each of the other examination methods mentioned uses different principles. Ultrasonic testing employs high-frequency sound waves, fluorescent testing typically utilizes dyes for surface inspection, and eddy current testing involves electromagnetic induction. These distinctions help highlight the specific applications and suitability of radiographic testing in scenarios requiring the examination of internal features without destroying the material.