Radiographic Testing (RT) using X-rays or gamma radiation (Se-75, Ir-192) is a volumetric NDT method used to evaluate the internal integrity of materials without causing damage. This technique enables the detection of internal discontinuities in welds, castings, pipe joints, and steel structures of complex geometries. The principle is based on recording the attenuation of radiation passing through the object—discontinuities and variations in material density affect absorption, resulting in contrast areas on the detector.
RT is a highly versatile method applicable to various materials, including steel, stainless steel, cast steel, cast iron, aluminum, ceramics, wood, rubber, plastics, and concrete. The method allows for the detection of internal discontinuities as well as density variations within the tested object. It is particularly effective for: butt and fillet welds, steel and cast iron castings, pressure vessels and heat exchangers, as well as pipeline components and support structures. RT reliably detects defects such as cracks, porosity, slag inclusions, lack of fusion, structural non-uniformities, and metallic or non-metallic inclusions.
Depending on the material thickness and geometry of the object, we utilize either X-ray equipment (for thin-walled structures and high-precision welds) or isotopic gamma sources—Selenium-75 (Se-75) and Iridium-192 (Ir-192)— for denser or thicker components. Due to the use of ionizing radiation, all RT inspections are performed under strict radiological protection measures. Our operators are fully certified and hold the necessary qualifications, and each inspection complies with nuclear regulatory requirements and internal safety procedures.