Materials Engineering, Evaluation, and Inspection
Spectrum uses radiography to detect volumetric flaws such as voids, gas pores and solid inclusions while ascertaining the nature and dimensions of such defects in a broad range of materials, sizes, and shapes.
Radiography is a nondestructive technology that employs X-ray and Gamma ray beams to detect internal imperfections, wall thickness and corrosion. Test material is exposed to a uniform ray from a radioactive isotope or an X-ray generator while a special film medium is placed on the opposite side of the component being examined. Upon development of the film, thickness and density disparities appear as gradients of black. To interpret radiographic film, technicians must be knowledgeable not only about welding and welding imperfections, but also about whether or not detected discontinuities are in fact defects.
Radiography can be utilized for most metallic as well as non-metallic materials. Typical test subjects include weld and weld overlays, castings, forgings, valves and their components, machined parts, pressure vessels, and structural steel. Radiographic film represents an easily observed, enduring record of the tested component.
Radiographic film images are two-dimensional, so determining the depth of a discontinuity may require additional tests. The thickness of the component to be examined informs the choice of radiation source. For example, Cobalt 60 gamma radiography can penetrate approximately 23 centimetres, or 9 inches, into carbon steel. Portable X-ray tubes are able to penetrate up to 4 centimetres, or 1.5 inches, of carbon steel. Fixed facility X-ray generators are normally used for thicker material.
Due to potential radiation hazards, Spectrum adheres to strict federal and provincial regulations regarding radiography, including removal of personnel and sensitive equipment from the test area. Our well trained and highly qualified technicians have a reputation for making safety a number one priority.