Film X-Ray Testing

Radiography is one of the most versatile non destructive testing methods.  Radiography can determine the internal soundness of a material (for example cracks, inclusions, voids)  without destroying it.  Radiography records the amount of radiation that penetrates a sample.  The magnitude (intensity) of the radiation that penetrates the sample indicates the attenuation of the radiation.  Areas of differential attenuation can be identified in the images generated in either film or real-time radiography.  These variations are caused by differences in density, material thickness, and material composition.  Since flaws, such as voids, inclusions, cracks, etc., constitute density variations, they can be identified in the image.

  Film radiography produces a still shadow-image of the test sample representing time-integrated radiation penetration.  Real-time radiography produces a live shadow-image on a video monitor.  When is film radiiography advantageous over real-time radiography?  Film Radiography is advantageous for very large items and very thick items (because more powerful x-ray generators can be used).

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